Forest River RIVERSTONE Fifth Wheels 421FK
The maker never published an MSRP for this floorplan. Unknown is not cheap. Treat any asking price against comparable models, not against zero.
dry weight 19,466 lb + fresh water (79 gal, full) 659 lb + propane + battery 200 lb + gear for 2 600 lb. Brochure dry weight omits water, propane, batteries and your gear; this estimate doesn't.
Judged the way the app judges: estimated loaded weight against each vehicle's rating less a 10% margin, per model year, because the 421FK'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 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-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) '17-19 | 32,500 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 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 86it doesn't fit
- Chevrolet Colorado / GMC Canyon (2.7 Turbo HO, tow pkg) '23-26: over by ~13,995 lb loaded
- Chevrolet Colorado / GMC Canyon (2.8 Duramax) '15-22: over by ~13,995 lb loaded
- Chevrolet Silverado / GMC Sierra 1500 (6.2 V8, max tow) '19-26: over by ~11,655 lb loaded
- Chevrolet Silverado / GMC Sierra 2500HD (Duramax, max tow) '24-26: over by ~740 lb loaded
- Chevrolet Silverado / GMC Sierra 2500HD (Duramax) '20-23: over by ~4,265 lb loaded
- Chevrolet Silverado / GMC Sierra 2500HD (Duramax) '11-19: over by ~4,635 lb loaded
- Chevrolet Silverado 1500 (max tow) '14-18: over by ~10,485 lb loaded
- Chevrolet Silverado EV (4WT) '24-26: over by ~9,675 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) '18-24: 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 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 ~11,205 lb loaded
- Ford F-150 (3.5 EcoBoost, max tow) '11-14: over by ~10,755 lb loaded
- Ford F-150 (3.5 EcoBoost, max tow) '15-20: over by ~10,215 lb loaded
- Ford F-150 (3.5 EcoBoost, max tow) '21-23: over by ~8,325 lb loaded
- Ford F-150 Lightning (max trailer tow) '22-26: over by ~11,925 lb loaded
- Ford F-250 Super Duty (6.7 diesel, gooseneck) '20-22: over by ~405 lb loaded
- Ford F-250 Super Duty (6.7 diesel, tow pkg) '17-19: over by ~4,725 lb loaded
- Ford F-250 Super Duty (6.7 diesel) '11-16: over by ~5,985 lb loaded
- Ford F-250 Super Duty (6.7 HO diesel, gooseneck) '23-26: over by ~225 lb loaded
- Ford F-350 Super Duty (6.7 diesel DRW, gooseneck) '11-16: over by ~1,485 lb loaded
- Ford Maverick (2.0 EcoBoost, 4K tow pkg) '22-26: over by ~17,325 lb loaded
- Ford Ranger (2.3 EcoBoost, tow pkg) '19-23: over by ~14,175 lb loaded
- Ford Ranger (2.7 EcoBoost, tow pkg) '24-26: over by ~14,175 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 ~14,175 lb loaded
- GMC Sierra EV '24-26: over by ~10,125 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 ~16,425 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 ~16,425 lb loaded
- Jeep Gladiator (3.6 V6, max tow) '20-26: over by ~13,995 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 ~14,490 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 ~12,140 lb loaded
- Nissan Titan XD (Cummins diesel) '16-19: over by ~9,485 lb loaded
- Ram 1500 (3.0 Hurricane, max tow) '25-26: over by ~10,475 lb loaded
- Ram 1500 (5.7 Hemi eTorque, max tow) '19-24: over by ~9,450 lb loaded
- Ram 1500 (5.7 Hemi, max tow) '11-18: over by ~11,365 lb loaded
- Ram 2500 (6.7 Cummins HO) '19-26: over by ~2,925 lb loaded
- Ram 2500 (6.7 Cummins) '11-18: over by ~4,745 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 ~11,025 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 ~11,025 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 ~15,075 lb loaded
- Toyota Tacoma (V6, tow pkg) '16-23: over by ~14,805 lb loaded
- Toyota Tundra (5.7 V8, tow pkg) '11-21: over by ~11,745 lb loaded
- Toyota Tundra (i-Force Max, tow pkg) '22-26: over by ~10,125 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 →
A missing row means the maker never published that figure: unknown, not zero.
- 1× Front primary bedroom bed(Permanent)72×80
Forest River (Better tier): Forest River's upper-tier luxury fifth wheel line: 3-inch hung-glass gel-coat fiberglass sidewalls, hydraulic slides, MORryde suspension and residential French-door refrigerators across a 38-45 foot range.
Findable: a few listed nationwide most weeks. Why: Forest River is a volume manufacturer; only one model year. Estimated from build volume and production span, not a count of live listings.
Sleeping data added by a later pass: Midwest Campers dealer listing, "Sleeps 4" Collected from a census gap: this line had no catalogue record at all. tier, bn and mat are the collecting pass's editorial read, not inherited from siblings. Slide-out count added by a later pass: floorplan alt text: has one entry and six slide outs
Live listings for the 421FK on the big marketplaces. Each search opens pre-filled with this exact floorplan:
Inventory varies by site and day. Slim pickings? search the whole RIVERSTONE Fifth Wheels line ↗
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 2026-09.