Monday, December 5, 2022


RV engineer spills the dirty truth about RV cargo capacity


In the alphabet soup of RV towing capacities, Cargo Carrying Capacity (CCC) is usually overshadowed by Gross Vehicle Weight Rating (GVWR), Gross Combined Weight Rating (GCWR), Gross Axle Weight Rating (GAWR) …

All right, I’ll stop! No sense in shoving alphabet soup down your throat until you vomit it back up. But you should really know more about your RV cargo capacity, because …

“But, Ross,” you interrupt, “that’s techno-talk. That’s for RV nerds (no offense). I’m just shopping around!”

Then you are EXACTLY who should be reading this post! Most buyers don’t pay attention to that little black-and-yellow sticker until AFTER their purchase, and by then it’s $75,000 too late.

What is RV cargo weight and how is it calculated?

RV cargo weight is how much “stuff” you can add before overloading the RV.

Calculating cargo capacity is governed by the FMVSS 110 and FMVSS 120 standards.

The simple equation is: CCC = GVWR – UVW

  • Where GVWR = Gross Vehicle Weight Rating, or the maximum scale weight of a fully loaded RV.
  • Where UVW = Unloaded (or Unladen) Vehicle Weight, which is the weight of the RV, plus operating fluids, as configured for delivery to the dealership. This will include forced options as well.

PUBLIC SERVICE ANNOUNCEMENT: A lot of the other so-called “RV blogs” are WRONG about Cargo Carrying Capacity! They’ll share an equation that’s been obsolete since 2008. Today, water, occupants and stuff are all considered “cargo,” and you’re responsible for tracking their weight.

Sounds simple, right? Well … there is a lot of fine print.

RV cargo capacity: What you need to know!

Let me do my part to clean up some of the myths and misconceptions about RV cargo weight capacities. Here are four things you should know:

1. Cargo labels are accurate to within ~100 lbs.

Dealers are allowed to add up to 100 lbs. or 1.5% of the GVWR (whichever is less) to the RV without replacing or correcting the CCC label.

This is because dealers commonly add batteries and small accessories to the RV. Because tires are not sensitive to very small overloads, NHTSA has allowed dealers to add accessories without the hassle of swapping stickers.

2. Propane and fuel are included in the base weight

The UVW includes the weight of full propane and fuel tanks.

That’s good news! In other words, the law assumes that propane is as critical to your RV as gasoline is to a car. So the weight of that propane is built into the base weight; you don’t need to track it separately.

Same thing with fuel: Gasoline and diesel are already included in the unladen weight.

3. Water and occupants are considered payload

… But water and occupants are treated as cargo.

This is why all RVs have a sticker explaining that water weighs 8.3 lbs. per gallon. That information helps you estimate the remaining cargo capacity after filling your freshwater tank (and don’t forget the water heater tank!).

^Now, this rule causes lots of confusion. Let’s see how the math plays out:

Example: If your RV has, say, 1,000 lbs. of cargo capacity, what’s left after filling your water tank (6 gallons) and freshwater tank (30 gallons)? We’ll ignore the water in the supply lines.

Eq: 1,000 – (6+30)*8.3 = 701 lbs.

So you’ve reduced your payload capacity by 300 lbs. just by filling up your tank! And if you were also carrying 15 gallons of black water and 20 gallons of gray water to the nearest dump site, you would only have 410 lbs. of payload left. Yikes!

4. The CCC sticker is law!

The CCC sticker isn’t just there for legal reasons.

As Tony Barthel shared in his post about dangerously overweight RVs, some salespeople told him that “the chassis are designed for much more than the sticker says.”

That is grossly inaccurate, deceptive, and dangerous. In my experience, RV manufacturers aren’t in the habit of arbitrarily knocking down capacities just to play it safe. We’re trying to make use of every pound we can!

And why does the salesperson think he can decide what the “real” cargo capacity is? Did he specify the axles? Did he calculate the tire reserve capacity? And did he run an FEA stress analysis on the frame? No??? I didn’t think so!

The dirty truth about RV cargo capacity

Here’s an unfortunate truth: CCC stickers don’t sell RVs. Cabinets do. People are like honeybees: We love to see little pockets full of goods and goodies.

So when you walk into a rig, what’s the first thing that catches your eye? Cabinets, cabinets, cabinets! The hidden sliding drawer beneath the dinette, the overhead cargo netting above the bed, the cavern beneath the master bed. And we haven’t even talked about the pass-through basement garage, the bike rack, the 300 lb. rear hitch…

But did you know that just filling your cabinets and storage spaces could overload your RV? 

Here’s what Forest River says:

Did you catch that? “You cannot necessarily use all available space when loading your unit.” Not unless most of your luggage is down comforters and bags of marshmallows, that is.

I would humbly argue that a significant number of RVs are built with inadequate RV cargo capacity. I think the problem is worst on:

  • Travel trailers longer than 30 feet
  • Extended Class C motorhomes, especially those on a 12k or 14.5k chassis
  • Gasoline-powered, front-engine Class A motorhomes
  • Any “ultralight” camper with 2+ slide-outs

But don’t lynch the manufacturer just yet! Yes, it’s easy to blame the builder—and they certainly are culpable. I’m not denying that. But when the customer keeps begging for higher towing capacities, for more slide-outs, for tile floors and dual air conditioners and not an inch of wasted space, then don’t be surprised when you get what you asked for. Et tu.

What’s a good cargo carrying capacity for an RV?

Pounds are like potato chips: One doesn’t seem like much, but when one follows the other—wait, where did the bag go?

Just remember how difficult it is to shrink your luggage to 40 lbs. for a checked bag on a plane!

I recommend at least 1,700 lbs. cargo capacity or 500 lbs. per person, whichever is greater. This is the minimum—more is better!

  • If you’re a full-timer, add 50%.
  • If you’re a boondocker or adventurer, add 25%.
  • If you plan on towing a second vehicle with your motorhome, add the tongue weight of the toad, dinghy or car hauler.
  • If you have a toy hauler, the weight of the toys should be added separately.

For some other back-of-the-envelope math, I’ve created the following graduated scale, where the minimum CCC should be:

  • 25% of the GVWR for RVs below 10,000 lbs.
  • 20% of the GVWR for RVs between 10,001 lbs. and 19,999 lbs.
  • 15% of the GVWR for RVS above 20,000 lbs.

To my knowledge, there is no minimum CCC legal regulation. So long as the RV manufacturer has met the tire loading requirements, CCC is left to their discretion.

I would not purchase an RV with a payload capacity of 1,000 lbs. or less unless it was a mini travel trailer (e.g., Scamp) or teardrop trailer.

Big takeaways for the RV owner

I’ve thrown a lot at you in the past 1,200 words. Here are the big takeaways:

  1. Don’t assume your RV can carry what you think it can based on storage space.
  2. Extended Class C’s, gasoline-powered Class A’s, and 30-ft.-plus travel trailers are the usual suspects.
  3. Get the cargo capacity from the CCC sticker, not the salesperson.
  4. Remember that occupants and water will count against cargo.
  5. Plan on 500 pounds per person plus extra for toys.
  6. If the numbers don’t add up, keep shopping.
  7. Weigh your RV after loading to double-check your estimates!


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David Jackman
27 days ago

I’m unclear on why a “toad” adds 750 lbs to the ccc. It seems to me that the only weight added to the motorhome would be the tongue weight of the tow bar. I understand the added weight of the toad will effect braking, but that’s what the supplemental braking systems are for. What am I missing?

RV Staff(@rvstaff)
26 days ago
Reply to  Ross Regis

It’s been fixed. Thanks, David and Ross. 😀 –Diane

28 days ago

My sticker does not address water tanks or propane tanks. The dealer was selling with one propane tank but I negotiated a second one and a second battery in my purchase so the weight of those would not be included in what the manufacturer put on the weight sticker.

I never tow with a full tank of water. Just enough to be on the road for a couple of days flushing the toilet and brushing teeth if boondocking and so I don’t have to connect to water if I’m in a park overnight. If boondocking for a while I fill up close to where I’m staying so it isn’t towed the whole way.

After full timing for two years I moved into my house and weighed everything I had been carrying around…almost 700#s over the CCC.

28 days ago

36 x 8.3lbs = 298.8lbs not 701.

Plus, water is usually taken into account when determining cargo capacity as shown in the pic provided. 🙂

Good article otherwise!

29 days ago

One more item – RVs are often much heavier on one side than the other, so the wheel(s) on one side of an axle may be carrying much more than half of the axle weight. That is why getting individual wheel weights is very important. You may be under the GAWR, and still have a tire that is overloaded. Setting the proper inflation pressure for an axle requires that the load on each end is known, and the pressure set for the heavier load, plus something for reserve capacity.

29 days ago

I am wondering who would have their fresh water tank, gray tank and black tank all full at the same time, as you figured at that top of the article? Don’t most people dump their tanks before they fill up the fresh water tank again?

29 days ago

No, a higher price does not necessarily equate to more CCC or OCCC. The Tiffin Wayfarer Class C is (in)famous for low OCCC’s, with people posting pics of their stickers of between 700 lbs and 1,000 lbs.

The Wayfarer has an MSRP approaching or exceeding $200,000 and used ones typically are well over $100,000. A driver, a passenger, and a little water and stuff can overload a Wayfarer.

But you’ll be a Tiffin owner! Or, rather, a Thor owner. 🙂

29 days ago

Great articles. A couple of clarifications:

– For a motorhome it’s an OCCC sticker, Occupant and Cargo Carrying Capacity. It’s on the entry door frame usually.

– Many people are under the impression that GVWR is solely while towing. While that is what the regs address, the same axles need to support the weight of the people inside once a trailer is parked. If the CCC is low on a trailer you can easily overload the axle(s) and frame while parked once you put your family of four inside.

– The CCC and OCCC are not calculated; they must be determined by actually weighing the RV before it leaves the factory. Options can make a huge difference in the CCC/OCCC availability if heavy options are added.

– When looking at RV’s, always take a pic of the sticker.

29 days ago

THis article should be a “must read” for any prospective RV buyer!

captain gort
29 days ago

My Sequoia 5.7 V8 is rated at 7300# tow capacity. I tow a Rockwood MiniLite 2109s. Sticker unloaded weight is about 4313#. Just my wife and I in the rig, not F/T…just trips. Loaded for a trip, the trailer weighs about 5800 with full water tank…that’s 100% of its allowable GVWR.
733# tongue weight. But with my wife and I in the Sequoia, with the usual basic stuff we carry, plus that tongue weight, it weighs about 7100#…which is 100% of its allowable GVWR.
Yet, the GCVWR (combined weight rating) is 91% of the sticker GCVWR. But really, I’m maxed out. That “4313#” trailer is really all my “7300” tow capacity TV can LEGALLY handle by the numbers…. BTW, it tows GREAT…been all over the USA with it. Blue Ox SwayPro hitch.

29 days ago

Interesting article, thank you very much. I’m still a bit confused as to what is and is not included in the ‘unloaded’ vehicle weight. You say the propane IS included but the water in the freshwater tank is NOT included? Is it possible that those rules are not the same in Canada? I made an inquiry about a year ago to Alliance RV and was told the label on the side of the trailer was different because I was in Canada. Can you comment?

Neal Davis
29 days ago

Very helpful information! Thank you! Did the math and our 2022 New Aire 3545 CCC (Net Cargo Capacity per Newmar) is 14.5% of the GVWR (5600÷38600). We downsized to the New Aire and this is a great reminder that our pile of stuff we put into the RV also must be downsized. Thank you!

Karel Carnohan DVM(@karel-carnohan)
29 days ago

Ross, thank you for this article. I have written here on RVTravel about the issues I have with the gas motor coaches built on the Ford F53 chassis. After upgrading springs and shocks, what I discovered is that the only way I can have a reasonably safe and stable ride is by lowering tire pressure (following tire mfg table). And it’s still not great! By taking features out of my Newmar 40′ Canyon Star toy hauler (the folding benches in the garage) and limiting cargo, I was able to reduce my tire pressures. Quite frankly, IMHO it is criminal the way the manufacturers load the chassis with solid wooden cabinets and trim and frankly ignore the problems weight creates.

Tom E
29 days ago

One of (the many) reasons we decided on our 5th wheel was the cargo carrying capacity, It has tandem 7000# axles that match the GVWR. With an UVW of 11,400#, stated CCC on the label is 2600#. Pin weight is just under 2000# leaving 9400# resting on the 14,000# combined axles. Our new-to-us 2016 5th wheel was built on a HD 12″ frame and I went from F to G rated tires (replacing the Chinabombs) for added assurance. We live out of our 5th wheel 7-8 months each year and fill the cabinets, basement, and center bunkroom (converted to a box room) with a little over 2000#. And I tow the 5th wheel with a 1 ton HD diesel dually with 5300# CCC (roughly 2500# margin after subtracting the pin weight, supplies, passengers…). When I tow the 5th wheel, the truck rides like a limo and takes 8-10% grades like a champ, exhaust braking coming back down only briefly touching the brakes. So yes, do your homework before making those purchases. It requires several months of research followed by long search.

Tom E
29 days ago
Reply to  Tom E

Oh, don’t listen to the showroom sales person. They only want your money and could care less whether you’re overloaded when you leave the lot.

Dennis G.
29 days ago

Our ’96 Flair comes in at 13,051 pounds (including me and the wife). That leaves us with 3,450 pounds fay under or water, waste tanks, or son and our food. We don’t have a toad, so we stay under weight. Glad we have the old class-a, with a decent weight rating.

29 days ago

Excellent article! I am definitely going to purge some stuff. Correction- LOTS of stuff.

Leonard Rempel
29 days ago

Excellent article!
When I went RV shopping, I wanted more than needed CCC. I looked at several 5th wheels that had less than 2,000 lbs CCC; YIKES! I settled on a more expensive 35′ Montana that has 4,000 CCC. After several add ons such as 4 x AGM batteries, washer dryer combo, water required when traveling, etc. we travel with a maximum of 2,500 CCC. Just my two cents.

Last edited 29 days ago by Leonard Rempel
Jim Johnson
29 days ago

The problem I have is there are no local scales available to the public for the purpose of weighing an RV trailer. And by local, I mean within 100+ miles. What am I going to a long way from home? Set up a roadside yard sale for the excess weight?

Fortunately, I am hauling a small single axle travel trailer. I cannot easily get an axle weight for the loaded trailer, but I CAN obtain a tongue weight with a stout wood frame and a relatively inexpensive crane scale rated for half a ton. I raise the tongue above level, place a S-hook under the coupler at level and lower the coupler until the hitch is suspended on the scale with the tongue jack just above the ground. Assuming that I have properly loaded the trailer, I should be able to determine if I am within the GVWR using the tongue weight.

The manufacturer specifies the UVW at 2,996, the GVWR at 3,850 and the maximum tongue weight at 350. So between 9%-12% of the trailer weight. So long as I am in that range I should be good.

Thomas D
29 days ago
Reply to  Jim Johnson

No gravel pits, blacktop plants in your area? I worked in a quarry and if we had time we could weigh you and even do individual wheels . No charge but we usually had plenty of beer at the end of the day. No CAT 🐱 scales? I can think of 3 within 20 miles.

Vickie L McClellan Benson
29 days ago
Reply to  Jim Johnson

I have no idea where you live, but if there is a feed store that sells bulk feed, they can weigh you. That is where I go every single time I load up my trailer. Sometimes I take more, sometimes I take less, but I always do it to make sure my tongue weight & CCC is accurate for my rigs.

Bill Fisher
29 days ago

Great article!

29 days ago

Interestingly, the CCC sticker shown at the top of this article contradicts the article. It states that the CCC is after a full tank of water (and fuel) but with empty waste tanks.

29 days ago

Looking at the small motorhome arena, inadequate OCCC is a plague. Snob appeal drives usage of the Sprinter chassis and “upscale” manufacturers like Tiffin and Airstream fill it with solid wood cabinets, leaving absurdly low capacities. Airstream manual says to never drive the Atlas (B+) with more than a 1/3rd full water tank! Tiffin Wayfarer this year even has a washer/dryer option in a 25 foot coach. Many lower end manufacturers, like Thor and Coachmen, use an E350 chassis where an E450 (+2k pound increase) would be much better for only about a 3k price increase. Thor Axis 24.1, for example, sleeps 5 people yet has an OCCC of about 1200 pounds.I expect that on any given day there are thousand of overloaded motorhomes on the road.

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