New 2023 Cougar 357UMR Fifth Wheel

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Cougar 357UMR Description

Keystone Cougar fifth wheel 357UMR highlights:

  • Fireplace
  • Theater Seating
  • Rear Mud Room
  • Hitch Vision™
  • Outside Shower
  • Dual Entry


This Cougar fifth wheel is amazingly unique because of the rear mud room that has its own exterior entry door! When you step foot into this space from outside, you'll see a pet-friendly utility shower to your left that you can use to wash off your dog's paws after playing all day out in the mud. There is a washer/dryer cabinet, so this space can also be used as a laundry room while you're out on the road, and you can even fold your clothes or store laundry baskets on the desk with overhead cabinets. Talk about residential living! When you make your way out of the mud room and into the main living area, you'll find even more homey comforts with the theater seating, sofa, kitchen island, fireplace, and LED HDTV. You'll also have plenty of space with opposing slides on either side. The front portion of this unit has a private bedroom that you can escape to each night, and there is a full-height wardrobe in the bedroom for great clothing storage.


Spend more time having fun and less time worrying about your RV with the Keystone Cougar fifth wheel! These units have all that you will need for excellent vacations. The interior comes with 5/8" one-piece DynaSpan® flooring, tall slide outs for added comfort and head room, night roller shades throughout, residential, raised-panel hardwood cabinet doors and drawers, decorative crown molding, a 5,500 BTU electric fireplace with thermostat control and remote, and a Max Air exhaust fan with rain sensor. The exterior is also fully outfitted with a convenience center, friction-hinge entry door, electric four-point auto leveling system, an LCI® SolidStep® on main entry, a full pass-through storage with slam-latch baggage doors, an industry-best 80-gallon fresh tank capacity, a 2" accessory hitch with 300-LB storage capacity, and an outside shower. 

Cougar 357UMR Specifications

Sleeps 4
Slides 3
Length 39 ft 4 in
Ext Height 13 ft 4 in
Interior Color Driftwood
Hitch Weight 2115 lbs
Dry Weight 11246 lbs
Cargo Weight 2454 lbs
Fresh Water Capacity 81 gals
Grey Water Capacity 76 gals
Black Water Capacity 76 gals
Tire Size ST235/80R16E
Furnace BTU 35500 btu
Available Beds Queen
Refrigerator Type Gas/Electric
Refrigerator Size 12 cu ft
Cooktop Burners 3
Number of Awnings 1
LP Tank Capacity 30 lbs
Water Heater Capacity 6 gal
Water Heater Type Rapid Recovery Gas/Electric
AC BTU 15000 btu
Awning Info 13' Power
Axle Count 2
Washer/Dryer Available Yes
Number of LP Tanks 2
Shower Type Shower w/Seat
Electrical Service 50 amp

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When Cole Davis founded Keystone RV in 1996 his vision was clear: to build a quality RVs loaded with features, and provided exceptional value to owners. To accomplish his goal, Cole would recruit and build a strong team, focus on keeping overhead low, and empower the people closest to the customer to make decisions.


Today, Keystone RV Company is the #1 manufacturer of towable RV’s in North America with more than a million owners, 5,000 team members and over a million square feet of manufacturing in Goshen, Indiana and Pendleton, Oregon. Although a lot has changed, Cole’s wisdom still guides us. Our goal is to surprise and delight our owners at each and every touchpoint, providing them with the information, quality, and assurance they need to move in the direction of their dreams – to Live It Out™