Keystone Montana Mountaineer 335RET

Name: Keystone Montana Mountaineer 335RET
Brand: Keystone

Fifth wheelbuilt 2010–11Mixed build tierFindable on the used market

WHAT ONE COSTS

$22,700est. used (2011, 15 yr old)

Sticker was $53,250 in 2010. Out of production since 2011, so the used market is the only way to buy one. Estimate assumes a 2011 unit.

WHAT IT WEIGHS BEHIND YOUR TRUCK

~11,879 lbestimated as towed, for 2 people

dry weight 10,545 lb + fresh water (64 gal, full) 534 lb + propane + battery 200 lb + gear for 2 600 lb. Brochure dry weight omits water, propane, batteries and your gear; this estimate doesn't.

You want a tow rating around13,200 lb (10% margin)

GVWR (the sticker maximum)14,280 lb

Tongue weight, loaded~2,568 lb (22%)

Cargo capacity3,735 lb

WHICH TOW VEHICLES IT FITS: 20 OF 95

Judged the way the app judges: estimated loaded weight against each vehicle's rating less a 10% margin, per model year, because the 335RET's published weights held steady. Fifth wheels also need a pickup bed and are held to the fifth-wheel rating where published.

VEHICLE	TOW RATING	VERDICT
Chevrolet Silverado / GMC Sierra 2500HD (Duramax, max tow) '24-26	22,500 lb	fits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 2500HD (Duramax) '20-23	18,510 lb	fits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 2500HD (Duramax) '11-19	18,100 lb	fits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 3500HD (Duramax DRW, gooseneck) '20-26	36,000 lb	fits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 3500HD (Duramax DRW, gooseneck) '11-19	23,300 lb	fits, loaded, with 10% margin
Ford F-150 (3.5 EcoBoost, max tow) '21-23	14,000 lb	fits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 diesel, gooseneck) '20-22	22,800 lb	fits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 diesel, tow pkg) '17-19	18,000 lb	fits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 diesel) '11-16	16,600 lb	fits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 HO diesel, gooseneck) '23-26	23,000 lb	fits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 diesel DRW, gooseneck) '17-19	32,500 lb	fits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 diesel DRW, gooseneck) '20-22	37,000 lb	fits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 diesel DRW, gooseneck) '11-16	21,600 lb	fits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 HO diesel DRW, gooseneck) '23-26	38,000 lb	fits, loaded, with 10% margin
Ford F-450 Super Duty (6.7 HO diesel DRW, gooseneck) '23-26	40,000 lb	fits, loaded, with 10% margin
Ram 2500 (6.7 Cummins HO) '19-26	20,000 lb	fits, loaded, with 10% margin
Ram 2500 (6.7 Cummins) '11-18	17,980 lb	fits, loaded, with 10% margin
Ram 3500 (6.7 Cummins DRW, gooseneck) '13-18	31,210 lb	fits, loaded, with 10% margin
Ram 3500 (6.7 Cummins HO DRW, gooseneck) '25-26	36,610 lb	fits, loaded, with 10% margin
Ram 3500 (6.7 Cummins HO DRW, gooseneck) '19-24	37,090 lb	fits, loaded, with 10% margin

The 75it doesn't fit

Chevrolet Colorado / GMC Canyon (2.7 Turbo HO, tow pkg) '23-26: over by ~4,949 lb loaded
Chevrolet Colorado / GMC Canyon (2.8 Duramax) '15-22: over by ~4,949 lb loaded
Chevrolet Silverado / GMC Sierra 1500 (6.2 V8, max tow) '19-26: over by ~2,609 lb loaded
Chevrolet Silverado 1500 (max tow) '14-18: over by ~1,439 lb loaded
Chevrolet Silverado EV (4WT) '24-26: over by ~629 lb loaded
Chevrolet Suburban (5.3 V8, max tow) '21-26: no pickup bed (cannot hitch a fifth wheel)
Chevrolet Tahoe (5.3 V8, max tow) '21-26: no pickup bed (cannot hitch a fifth wheel)
Chevrolet Traverse (tow pkg) '18-26: no pickup bed (cannot hitch a fifth wheel)
Chrysler Pacifica '17-26: no pickup bed (cannot hitch a fifth wheel)
Dodge Durango (5.7 / 6.4 Hemi, tow pkg) '14-26: no pickup bed (cannot hitch a fifth wheel)
Ford Bronco 4-dr (2.7 EcoBoost, tow pkg) '21-26: no pickup bed (cannot hitch a fifth wheel)
Ford Expedition (3.5 EcoBoost, tow pkg) '25-26: no pickup bed (cannot hitch a fifth wheel)
Ford Expedition (3.5 EcoBoost, tow pkg) '18-24: no pickup bed (cannot hitch a fifth wheel)
Ford Explorer (3.0 EcoBoost, tow pkg) '20-26: no pickup bed (cannot hitch a fifth wheel)
Ford F-150 (3.5 EcoBoost, max tow) '24-26: over by ~2,159 lb loaded
Ford F-150 (3.5 EcoBoost, max tow) '15-20: over by ~1,169 lb loaded
Ford F-150 (3.5 EcoBoost, max tow) '11-14: over by ~1,709 lb loaded
Ford F-150 Lightning (max trailer tow) '22-26: over by ~2,879 lb loaded
Ford Maverick (2.0 EcoBoost, 4K tow pkg) '22-26: over by ~8,279 lb loaded
Ford Ranger (2.3 EcoBoost, tow pkg) '19-23: over by ~5,129 lb loaded
Ford Ranger (2.7 EcoBoost, tow pkg) '24-26: over by ~5,129 lb loaded
Ford Transit (HD tow pkg) '15-26: no pickup bed (cannot hitch a fifth wheel)
GMC Acadia (tow pkg) '20-26: no pickup bed (cannot hitch a fifth wheel)
GMC Hummer EV Pickup '22-26: over by ~5,129 lb loaded
GMC Sierra EV '24-26: over by ~1,079 lb loaded
GMC Yukon / Yukon XL (5.3 V8, max tow) '21-26: no pickup bed (cannot hitch a fifth wheel)
Honda Odyssey '18-26: no pickup bed (cannot hitch a fifth wheel)
Honda Passport (AWD) '19-26: no pickup bed (cannot hitch a fifth wheel)
Honda Pilot (AWD, tow pkg) '16-26: no pickup bed (cannot hitch a fifth wheel)
Honda Ridgeline (AWD) '17-26: over by ~7,379 lb loaded
Hyundai Palisade (tow pkg) '20-26: no pickup bed (cannot hitch a fifth wheel)
Hyundai Santa Cruz (2.5T AWD) '22-26: over by ~7,379 lb loaded
Jeep Gladiator (3.6 V6, max tow) '20-26: over by ~4,949 lb loaded
Jeep Grand Cherokee (5.7 Hemi) '11-21: no pickup bed (cannot hitch a fifth wheel)
Jeep Grand Cherokee (WL, tow pkg) '22-26: no pickup bed (cannot hitch a fifth wheel)
Jeep Grand Cherokee L (5.7 Hemi) '21-26: no pickup bed (cannot hitch a fifth wheel)
Jeep Grand Wagoneer (Hurricane, max tow) '22-26: no pickup bed (cannot hitch a fifth wheel)
Jeep Wagoneer (Hurricane, max tow) '22-26: no pickup bed (cannot hitch a fifth wheel)
Jeep Wrangler Unlimited 4-dr (tow pkg) '18-26: no pickup bed (cannot hitch a fifth wheel)
Kia Telluride (tow pkg) '20-26: no pickup bed (cannot hitch a fifth wheel)
Land Rover Defender '20-26: no pickup bed (cannot hitch a fifth wheel)
Land Rover Discovery '17-26: no pickup bed (cannot hitch a fifth wheel)
Lexus GX 550 (tow pkg) '24-26: no pickup bed (cannot hitch a fifth wheel)
Lexus LX 600 '22-26: no pickup bed (cannot hitch a fifth wheel)
Mazda CX-90 (3.3 turbo, tow pkg) '24-26: no pickup bed (cannot hitch a fifth wheel)
Mercedes-Benz Sprinter '19-26: no pickup bed (cannot hitch a fifth wheel)
Nissan Armada (3.5 twin-turbo, tow pkg) '25-26: no pickup bed (cannot hitch a fifth wheel)
Nissan Armada (tow pkg) '17-24: no pickup bed (cannot hitch a fifth wheel)
Nissan Frontier (3.8 V6, tow pkg) '22-26: over by ~5,444 lb loaded
Nissan Pathfinder (tow pkg) '22-26: no pickup bed (cannot hitch a fifth wheel)
Nissan Titan (5.6 V8, tow pkg) '17-24: over by ~3,094 lb loaded
Nissan Titan XD (Cummins diesel) '16-19: over by ~439 lb loaded
Ram 1500 (3.0 Hurricane, max tow) '25-26: over by ~1,429 lb loaded
Ram 1500 (5.7 Hemi eTorque, max tow) '19-24: over by ~404 lb loaded
Ram 1500 (5.7 Hemi, max tow) '11-18: over by ~2,319 lb loaded
Ram ProMaster '14-26: no pickup bed (cannot hitch a fifth wheel)
Rivian R1S '22-26: no pickup bed (cannot hitch a fifth wheel)
Rivian R1T '22-26: over by ~1,979 lb loaded
Subaru Ascent '19-26: no pickup bed (cannot hitch a fifth wheel)
Subaru Outback (XT / Wilderness) '20-26: no pickup bed (cannot hitch a fifth wheel)
Tesla Cybertruck '24-26: over by ~1,979 lb loaded
Tesla Model X (tow pkg) '16-26: no pickup bed (cannot hitch a fifth wheel)
Tesla Model Y (tow pkg) '21-26: no pickup bed (cannot hitch a fifth wheel)
Toyota 4Runner (4.0 V6) '11-24: no pickup bed (cannot hitch a fifth wheel)
Toyota 4Runner (i-Force Max) '25-26: no pickup bed (cannot hitch a fifth wheel)
Toyota Grand Highlander (i-Force Max) '24-26: no pickup bed (cannot hitch a fifth wheel)
Toyota Highlander (tow pkg) '20-26: no pickup bed (cannot hitch a fifth wheel)
Toyota Land Cruiser (i-Force Max) '24-26: no pickup bed (cannot hitch a fifth wheel)
Toyota Sequoia (i-Force Max, tow pkg) '23-26: no pickup bed (cannot hitch a fifth wheel)
Toyota Sienna '21-26: no pickup bed (cannot hitch a fifth wheel)
Toyota Tacoma (i-Force Max, tow pkg) '24-26: over by ~6,029 lb loaded
Toyota Tacoma (V6, tow pkg) '16-23: over by ~5,759 lb loaded
Toyota Tundra (5.7 V8, tow pkg) '11-21: over by ~2,699 lb loaded
Toyota Tundra (i-Force Max, tow pkg) '22-26: over by ~1,079 lb loaded
Volkswagen Atlas (tow pkg) '18-26: no pickup bed (cannot hitch a fifth wheel)

These verdicts assume 2 people aboard with typical gear. See the margin for your truck and your crew →

THE SPECS

Length35.3 ft

Height (incl. A/C)12.8 ft

Width8.0 ft

GVWR14,280 lb

Dry weight10,545 lb

Dry tongue weight2,280 lb

Cargo capacity3,735 lb

Sleeps6

Slide-outs3

Axles2

Fresh water64 gal

Grey water93 gal

Black water93 gal

A missing row means the maker never published that figure: unknown, not zero.

WHERE PEOPLE SLEEP

1× Front bedroom queen(Permanent)—
1× Dinette converts(Convertible)—
1× Sofa converts(Convertible)—

HOW IT'S BUILT: 3/5

WallsLaminated fiberglass

FrameAluminum

RoofStandard

UnderbellyEnclosed

Keystone (Mixed tier): Montana

YEAR BY YEAR: WHAT CHANGED

2010Introduced
2012Dropped

FINDING ONE

Findable: a few listed nationwide most weeks. Why: Keystone is a volume manufacturer; only 2 model years; 15 years out of production. Estimated from build volume and production span, not a count of live listings.

OUR TAKE

Rear-entertainment plan with dual 93 gal grey and black tanks. GVWR derived from shipping weight plus capacity.

OTHER MONTANA MOUNTAINEER FLOORPLANS

285RLD · 14,185 lb · sleeps 6 290RLT · 14,045 lb · sleeps 6 291RLT · 14,295 lb · sleeps 6 295RKD · 14,395 lb · sleeps 6 298RLS · 12,690 lb · sleeps 6 303RLD · 13,960 lb · sleeps 6 305RLT · 14,185 lb · sleeps 6 307RKD · 14,080 lb · sleeps 6 310RET · 14,295 lb · sleeps 6 319BHD · 13,880 lb · sleeps 8 324RLQ · 14,400 lb · sleeps 6 325RLT · 14,140 lb · sleeps 6 326RLT · 14,185 lb · sleeps 6 327RLT · 14,090 lb · sleeps 6 the whole line →

Find one for sale

Live listings for the 335RET on the big marketplaces. Each search opens pre-filled with this exact floorplan:

RV Trader ↗Camping World ↗FB Marketplace ↗Google ↗

Inventory varies by site and day. Slim pickings? search the whole Montana Mountaineer line ↗

Is the 335RET your #1, or just a spec sheet?

These are the facts. Whether it beats the other six thousand rigs for you depends on what you care about. Set your priorities as sliders, switch on your hard limits, and watch the whole market re-rank around them. Every exclusion explained, every margin shown.

See where it ranks for you →

Data compiled from dealer and aggregator listings, retrieved 2026-07.