RV review: 2026 Keystone Cougar 316RLS—nicely updated, nicely improved

Today’s RV review is the 2026 Keystone Cougar 316RLS fifth wheel. This is one of the more popular members of the Cougar family, and if you’ve looked at this before, it’s time to do so again. We looked at the Keystone Cougar 316RLS a few years ago, and a lot has changed since then. Much of that is a big improvement in the way I look at RVs. 

This is a very common floor plan that, I believe, just about all builders of fifth wheels make. To me, that means you can see the things Keystone prioritizes in the Cougar line and evaluate whether those priorities align with yours. So, let’s start on the ground and work our way up as we’ve discussed before. 

But first, know that a Cougar isn’t a Cougar. there are actually three variations on them: Cougar Sport, Cougar Half Ton, and Cougar Premium. This is a member of the Cougar Premium. And, yes, I did say some unkind things under my breath, reading the word “Half Ton” in the description of those mid-sized Cougars. It drives me nuts to recommend a whole breed of pickups with wildly different capabilities in the branding of fifth wheels. 

I’d love to get some tarted-up half-ton pickup and let an RV decision maker take it over the Rockies and see just how quickly that term never ever not ever appears on their marketing again. Have I mentioned it’s driving me nuts?

Start at the road with the Keystone Cougar 316RLS

There is so much to like about what Keystone has been up to here, where so many people don’t look. The suspension itself has been upgraded with a Road Armor™ equalizer, which should help with road harshness. This also incorporates wet bolts, which means you can grease them for longer life. 

This uses Rainier H-rated tires and 6,000-pound axles. Nice. 

There are also anti-lock brakes whose technology also incorporates a bit of sway mitigation, a very useful feature. 

However, one area where they missed the mark was by not including a tire pressure monitoring system as standard. I think all towable RVs should have this feature without exception. They did so many other things right that this is a surprise. And a disappointment. 

Looking down from above, this uses an AlphaPly roofing system, which I think is the best membrane roofing system available. These tend to need less tending. 

Something new is Keystone’s use of a Power Watchdog™ SafeView power inlet. As you may have read here, there are new standards in power called a GMI (ground monitor interrupter) plug. I’m not sure if this is an early step toward that, but it’s similar to what all RVs will have eventually. 

Another structural thing I like is that all three of the slide rooms in this trailer are rack-and-pinion slides. To me, this is the best type of slide mechanism. Many fifth wheels use the rack and pinion on the lower, heavier slides, but then use a Schwintek or other mechanism on the upper bedroom slide. Not here. 

Of course, the underbelly is heated, and there are 12-volt heating pads on the tanks as well. 

Keystone Cougar 316RLS - 2026

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Bathroom in the Keystone Cougar 316RLS

One of the biggest changes you’ll find to this floor plan is in the bathroom. The bathroom here is larger than it had been, but still features a large rectangular shower with a seat in it. Something Keystone did that all RV builders should do is put a proper shower head in here instead of the typical lousy shower head in so many RVs. 

In the past, this had two sinks on the vanity. Thankfully, those have now become one sink with more counter space. I don’t know who needs two sinks unless you’re a competitive toothbrush champion—but this is better. To me, anyway. However, there is no proper medicine cabinet.

There is a cabinet here with a couple of open cubbies and a larger number of storage spaces behind a cabinet door. This door features a soft-close mechanism, as do all the doors and cabinets in here. 

Bedroom in the Keystone Cougar 316RLS

The closet in the nose cap of this rig has also been reconfigured. However, it still features good space as well as the plumbing and wiring for a washer and dryer. There’s also more storage in a chest of drawers at the foot of the bed. 

There’s a queen-sized bed standard, which is in the slide room we mentioned earlier. You can opt for a king-sized bed if you’d like.

Kitchen in the Keystone Cougar 316RLS

I really like the way the kitchen has been done in this trailer with a large three-burner stove, along with a 21” oven, residential-sized microwave, a 12-volt refrigerator, and an island with a sink. On that island are a good number of drawers, plus there’s a drawer with a paper towel holder that can be taken out and stood on the counter or wherever. 

There’s a pantry at the front of this space, along with a countertop. There’s additional storage behind the large TV. Storage is a strong suit of this floor plan. 

This also uses the type of dining surface where there are two free-standing chairs on one side and an ottoman against the wall that uses a cushion on the wall as the backrest. The ottoman has additional storage in it, and you can use it as a footrest for the couch or just as a seat. 

The dining table can also be rotated so the two chairs can be used to look out the windows. There are plenty of windows, indeed. This dining space is nicely flexible. 

Functionality you’ll like in the Keystone Cougar 316RLS

There are a few bits of technology that I think are worthwhile in this trailer. One of those is the Furrion Chill Cube air conditioner in the back of this model. I linked to the article I wrote about these, and they’re my favorite RV A/C system right now. However, do know that Coleman has a competitor coming very soon.

This is wired up for three air conditioners. Unfortunately, the Chill Cube is tall enough that it can’t be the one over the bedroom, so you’re stuck with something else there.

Speaking of wiring, I have been a fan of the way Keystone wires their RVs using intentional wiring choices rather than having the team in assembly just randomly pick. Doing it the way Keystone does means it’s much easier to service and also less likely to need service.

A greater number of us RVers have probably had more issues with plumbing than with wiring, and something new is Keystone’s use of a water manifold system that allows you to disable individual fixtures. The nice thing about this is that, if there is an issue with one fixture, you can disable that fixture and keep on camping on.

Conclusions on the Keystone Cougar 316RLS

Overall, I think Keystone has done a good job with a fifth wheel that’s already popular and has improved it in several areas. 

Keystone has been a company that has been at the forefront of factory-installed solar systems. This one features a minimal system with 220 watts of solar and a Victron MPPT 30-amp controller. I think a lot of RVers won’t use solar just because they’re mostly in RV parks. But this is set so that if you want more solar, it’s an easy upgrade. Keystone also offers higher-capacity systems from the factory. 

Speaking of options, there are some that you might consider, including two full-body paint options that result in a black or very dark gray exterior. Keystone did a video showing why these aren’t significantly hotter in the summer. You can also get these in a green full-body paint that I really like called the Hero Edition. This represents a partnership with the Wounded Warrior Project. I like that too. 

Other than the fact that someone made the lousy decision to make the tire pressure monitoring system an option, I really like the direction Keystone has taken with the updates and changes to this model. 

My thanks to Josh from Bish’s RV for the video and photos in this article.

MORE KEYSTONE RV REVIEWS:

• The 2025 Keystone Reign 15RB is a small, high-end travel trailer
• 2026 Keystone Walkabout 26MAX—An outdoor beast with an indoor soul
• No amenities spared on behemoth Keystone Raptor 444 toy hauler fifth wheel trailer
• Are new RVs as good as old? The Keystone Montana 3123RL is

More about these RV reviews

These RV reviews are written based on information provided by the manufacturers along with our writer’s own research. They are based on information from a single unit and may not reflect your actual experience. Shop your RV and dealership carefully before making a buying decision. 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.

Tony comes to RVtravel.com having worked at an RV dealership and been a lifelong RV enthusiast. He also has written the syndicated Curbside column about cars. 

You can also check out Tony and Peggy’s RV podcast.

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