Sunday, March 26, 2023


RV Review: 2021 Forest River Sunseeker MBS 2400B

By Tony Barthel
To me, awards are funny things. I’m not sure what the qualifications are for some awards but lots of things receive them, including Forest River’s Sunseeker MBS 2400B motorhome – which got one for “Best of Show” in 2020. If nothing else, it made me curious, so I took a closer look.

The Sunseeker line of motorhomes is three Class C motorhome floor plans on the Mercedes-Benz Sprinter cutaway chassis, which means they’re powered by that company’s 3.0 liter diesel V6 engine. That also means all the features in the cab that come directly from the world’s largest truck manufacturer whom we think of as a luxury car manufacturer in the U.S. 

Sunseeker 2400b floor plan

But because of that reputation, the van that delivers your Wurst in Germany gets a serious upgrade in interior fitting and delivers luxury in the U.S. – well, and packages for FedEx. But that also means things like stability control, safety features and chassis engineering are done by a company that has often set the standard for those kinds of things on a global basis. 

That also means you get things like side-view cameras, lane-departure control and more, which are a big safety bonus. As Mercedes-Benz progresses in the motorhome cab world, those cabs get nicer and nicer and less like the vans that deliver your Omaha steaks. 

That’s the front half of this; the back is all Forest River. 

The motorhome half of the Sunseeker is what we come here to read about. I took a look at the Sunset 2400B, a 25.5-foot-long Class C that features a large slide room that encompasses almost the entire road side of the RV portion of the coach. In that slide are a dinette in the front and a queen-sized walk-around bed in the back. 

But wait – if you’re not interested in the dinette you could do what I would do and swap it out for a set of 12-volt-powered theater seats. Now you’re cooking with gas! Well, OK – propane. 

Maybe this vehicle got an award because they anticipated the things I normally knock in these reviews – as the kitchen consists of a three-burner countertop stove but a convection microwave below that in the countertop where you might otherwise expect to find the oven. 

I haven’t used a convection microwave but I’ve read that they perform like an oven when you need that functionality and also can reheat yesterday’s campfire chili like any other microwave. Slick. 

There’s a deep-bowl round sink and a cover which, when in place, works with the glass top on the two-burner stove to make one big countertop. Well, not that big, but big enough. 

The term “12-volt powered” can be applied to a number of things in this coach which you might not usually read, including both the bedroom and bunk televisions and the refrigerator too. Since the fridge doesn’t need all the space consumed normally by a gas-electric mechanism, you get 10.7 cubic feet of space in which to chill your goodies. Compressor-based refrigerators like these also cool significantly faster, but you had better have your 12-volt power or no cold for you. 

No worries. Standard equipment includes a 3.6KW propane generator, but you can also have the vehicle outfitted with a diesel generator if you prefer. 

Thinking about the space above the cab, there are two very different options you can choose here: either a larger over-cab area that incorporates a sleeping bunk or a smaller over-cab area that incorporates the 12-volt TV and some cabinet space. Should you not choose the bunks, the cab is a bit more aerodynamically shaped (according to Forest River). 

I’m not sure any RV can be described as “fuel efficient” but owners of these have bragged to me about getting fuel mileage in the mid-teens. So that’s better than many, many other RV choices including most travel trailers towed by pickups. In fact, it’s better than I was getting towing a small travel trailer with a mid-sized pickup. 

As with many Forest River products, these come with a whole-RV water filter, which is cool. But I found that replacement filters are pricey and need to be ordered from one of a small number of suppliers. Honestly, in my trailer I’ve bypassed the filter enclosure altogether – but it’s a standard feature if you think differently than I do. Most normal people do. 

One of the features Sunseeker brags about is their residential mattresses, which is a good thing to be sure; however, this particular mattress can’t be used with the slide room in. The mattress is sort of split in half so that when the slide room is in, the mattress halves fold on top of one another and I wonder just how comfortable this really is. I know my wife’s hips would likely end up right on the split and then I would get the full report on how uncomfortable that is. 

Perhaps one of the reasons for the award might be the cabinets that are available in either “Black Diamond Walnut” or “Vermont Oak.” Both options are attractive, which is nice considering the entire back wall of the bedroom is cabinetry. There’s a good amount of storage – you’re just not getting to it with the slide room in. 

Sunseeker 2400b specifications

You do seem to be able to get to the bathroom with the slides in, though, which is a plus, and the Sunseeker folks also have a sink cover in there so that the whole bathroom countertop is one flat surface. My wife asked why they did this and I reminded her of how many contact lenses have ended-up in the gray tank. Oh… yeah… 

I’ve seen a few of these Sunseeker models with the optional full-body paint and while I’m no fan of the swoopy paint or sticker appearance of most new RVs, I did really think this was done in good taste from the standpoint of swoopy detailing. 

With the variety of configurations available in this model that include over-cab bed space and a jackknife sofa or theater seats and a more streamlined cab, you could get one of these Sunseeker 2400B models to suit a larger group of campers (sleeping space for six) or a couple who appreciates plenty of cabinet space. Whichever group you fall into, the Sunseeker might be a good fit for your camping style. 

These RV reviews are written based on information provided by the manufacturers along with our writer’s own research. We receive no money or other financial benefits from these reviews. They are intended only as a brief overview of the vehicle, not a comprehensive critique, which would require a thorough inspection and/or test drive.


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Alan Bailey
9 months ago

Where can I find a tutorial on the touchscreen in my sun seeker 2400b? Trying to figure out the AGS for starters.

2 years ago

I’ll also add that our Sunseeker is on the Ford E450 chassis.
It has a huge advantage over any MB chassis when it comes to CCC. Lots more Ford service centres than MB…..even if they don’t all accommodate larger FORD vehicles.
On the topic of fuel mileage comparisons…..I didn’t buy an RV thinking it would get great mileage. How aerodynamic is a brick? 😁

2 years ago

Forgot to say, our 2018 Forester is a Ford gas engine. We specifically avoid the Mercedes diesel, our previous RV was Mercedes and completely unreliable.

2 years ago

We have a 2018 Forester. Same floor plan except there is a window in the back. We like it. Split mattress is comfortable, no one’s butt sinks. Dinette seats are fine to eat but this needs some way to be comfy when reading or watching TV.

2 years ago

We have basically the same floor plan, minus the cupboards on the back wall. Instead, we have deep overhead cupboards across the head of the bed, and drawers underneath the split mattress. Unlike the 2400B model, our bedroom storage space is available even with the slide in. We have the same split mattress and find it as comfortable as the pillow top mattress we had in our previous Class A motorhome…..and no one’s butt is on the seam.

Ken S
2 years ago

These reviews are enjoyable, but it would be enormously helpful, for newbies especially, to include weight ratings.
Most beneficial would be the calculation of CCC for each coach. People too often neglect to consider CCC and safety when RV shopping.

Ralph Gagliano
1 year ago
Reply to  Ken S

Little new at this what exactly is “ccc’ ?

RV Staff
1 year ago
Reply to  Ralph Gagliano

Hi, Ralph. “CCC” stands for “cargo carrying capacity.” Here’s an article about it: Welcome to RVing, and! 🙂 –Diane

RV Staff
1 year ago
Reply to  Ralph Gagliano

Hi, Ralph. Here’s another helpful article I just ran across with more information about weight ratings:

I hope those articles help.

Have a great day! 🙂 –Diane

Last edited 1 year ago by RV Staff
2 years ago

We had a FR Benz chassis Class C. Typically got 16 mpg. Once, we “drafted” behind a tractot trailer at 67 mph while towing our Smart car, just after a fillup. After about 110 miles, filled up again .. wow! Averaged just under 20 mpg! The downside of fuel efficiency? Not all Benz dealers will service RVs and if you they do, an oil change is $275+. Yup, the filter is on top, drain on bottom, easy DIY project. However comma be sure to document purchase of and use only Mercedes spec oil, otherwise, your warranty will not be honored if engine breaks. After couple years, zero issues with the Benz, some valuable upgrades and exorbitant routine service costs, we parted ways. We are now RVing happily ever after in a Ford Fleetwood V-10 that averages 11 mpg .. maybe 13 on the flat with a tailwind. Haven’t required dealer service but very reassuring to know they’re as common as fast food joints.

2 years ago

I have a 2020 Thor Quantum Sprinter model KM24…same same layout….bed is very nice and comfortable. We added a 3″ topper to make it even better. Its amazing how many models from different manufactures are EXACTLY the same interior…just more splash here and there…my guess is this model will MSRP around 150K….

Donald N Wright
2 years ago

I have always wondered who gives products these phony awards. If the unit is a “sun seeker”, why would you paint it black like a solar oven? I would rather have Snoopy than Swoopy for a paint job.

2 years ago

Why don’t you at least indicate the manufacturer’s “suggested” list prices in your reviews so that we can all see how much all of this “wonderfullness” costs!

RV Staff
2 years ago
Reply to  DEAN W BROWN

Hi, Dean. When the price is available, Tony includes it in the chart. The price for this RV wasn’t available at press time, as he mentioned in the chart. —Diane at

2 years ago

It would be useful if these reviews included the MSRP.

RV Staff
2 years ago
Reply to  rich

Hi, Rich. Did you notice on the chart that it says the List Price was “N/A [not available] at press time”? Tony puts in the price when there is something to put in. 🙂 —Diane at

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