CamperHardlyKnowHer

Forest River Rockwood Roo 21SS

Hybridbuilt 2008–23Better build tierCommon on the used market
WHAT ONE COSTS
$33,500est. used (2023, 3 yr old)

Sticker was $46,255 in 2023 — out of production since 2023, so the used market is the only way to buy one. Estimate assumes a 2023 unit.

WHAT IT WEIGHS BEHIND YOUR TRUCK
~6,297 lbestimated as towed, for 2 people

dry weight 5,047 lb + fresh water (54 gal, full) 450 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 around7,000 lb (10% margin)
GVWR (the sticker maximum)6,548 lb
Tongue weight, loaded~684 lb (11%)
WHICH TOW VEHICLES IT FITS — 63 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 21SS's published weights changed mid-run.

VEHICLETOW RATINGVERDICT
Chevrolet Colorado / GMC Canyon (2.7 Turbo HO, tow pkg) '23-267,700 lbfits, loaded, with 10% margin
Chevrolet Colorado / GMC Canyon (2.8 Duramax) '15-227,700 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 1500 (6.2 V8, max tow) '19-2613,300 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 2500HD (Duramax, max tow) '24-2622,500 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 2500HD (Duramax) '20-2318,510 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 2500HD (Duramax) '11-1918,100 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 3500HD (Duramax DRW, gooseneck) '20-2636,000 lbfits, loaded, with 10% margin
Chevrolet Silverado / GMC Sierra 3500HD (Duramax DRW, gooseneck) '11-1923,300 lbfits, loaded, with 10% margin
Chevrolet Silverado 1500 (max tow) '14-1812,500 lbfits, loaded, with 10% margin
Chevrolet Silverado EV (4WT) '24-2612,500 lbfits, loaded, with 10% margin
Chevrolet Suburban (5.3 V8, max tow) '21-268,300 lbfits, loaded, with 10% margin
Chevrolet Tahoe (5.3 V8, max tow) '21-268,400 lbfits, loaded, with 10% margin
Dodge Durango (5.7 / 6.4 Hemi, tow pkg) '14-268,700 lbfits, loaded, with 10% margin
Ford Expedition (3.5 EcoBoost, tow pkg) '18-249,300 lbfits, loaded, with 10% margin
Ford Expedition (3.5 EcoBoost, tow pkg) '25-269,600 lbfits, loaded, with 10% margin
Ford F-150 (3.5 EcoBoost, max tow) '24-2613,500 lbfits, loaded, with 10% margin
Ford F-150 (3.5 EcoBoost, max tow) '11-1411,300 lbfits, loaded, with 10% margin
Ford F-150 (3.5 EcoBoost, max tow) '15-2013,200 lbfits, loaded, with 10% margin
Ford F-150 (3.5 EcoBoost, max tow) '21-2314,000 lbfits, loaded, with 10% margin
Ford F-150 Lightning (max trailer tow) '22-2610,000 lbfits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 diesel, gooseneck) '20-2222,800 lbfits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 diesel, tow pkg) '17-1918,000 lbfits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 diesel) '11-1616,600 lbfits, loaded, with 10% margin
Ford F-250 Super Duty (6.7 HO diesel, gooseneck) '23-2623,000 lbfits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 diesel DRW, gooseneck) '20-2237,000 lbfits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 diesel DRW, gooseneck) '17-1932,500 lbfits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 diesel DRW, gooseneck) '11-1621,600 lbfits, loaded, with 10% margin
Ford F-350 Super Duty (6.7 HO diesel DRW, gooseneck) '23-2638,000 lbfits, loaded, with 10% margin
Ford F-450 Super Duty (6.7 HO diesel DRW, gooseneck) '23-2640,000 lbfits, loaded, with 10% margin
Ford Ranger (2.3 EcoBoost, tow pkg) '19-237,500 lbfits, loaded, with 10% margin
Ford Ranger (2.7 EcoBoost, tow pkg) '24-267,500 lbfits, loaded, with 10% margin
GMC Hummer EV Pickup '22-267,500 lbfits, loaded, with 10% margin
GMC Sierra EV '24-2612,000 lbfits, loaded, with 10% margin
GMC Yukon / Yukon XL (5.3 V8, max tow) '21-268,400 lbfits, loaded, with 10% margin
Jeep Gladiator (3.6 V6, max tow) '20-267,700 lbfits, loaded, with 10% margin
Jeep Grand Cherokee (5.7 Hemi) '11-217,200 lbfits, loaded, with 10% margin
Jeep Grand Cherokee L (5.7 Hemi) '21-267,200 lbfits, loaded, with 10% margin
Jeep Grand Wagoneer (Hurricane, max tow) '22-269,850 lbfits, loaded, with 10% margin
Jeep Wagoneer (Hurricane, max tow) '22-2610,000 lbfits, loaded, with 10% margin
Land Rover Defender '20-268,201 lbfits, loaded, with 10% margin
Land Rover Discovery '17-268,201 lbfits, loaded, with 10% margin
Lexus GX 550 (tow pkg) '24-269,096 lbfits, loaded, with 10% margin
Lexus LX 600 '22-268,000 lbfits, loaded, with 10% margin
Mercedes-Benz Sprinter '19-267,500 lbfits, loaded, with 10% margin
Nissan Armada (3.5 twin-turbo, tow pkg) '25-268,500 lbfits, loaded, with 10% margin
Nissan Armada (tow pkg) '17-248,500 lbfits, loaded, with 10% margin
Nissan Frontier (3.8 V6, tow pkg) '22-267,150 lbfits, loaded, with 10% margin
Nissan Titan (5.6 V8, tow pkg) '17-249,760 lbfits, loaded, with 10% margin
Nissan Titan XD (Cummins diesel) '16-1912,710 lbfits, loaded, with 10% margin
Ram 1500 (3.0 Hurricane, max tow) '25-2611,610 lbfits, loaded, with 10% margin
Ram 1500 (5.7 Hemi eTorque, max tow) '19-2412,750 lbfits, loaded, with 10% margin
Ram 1500 (5.7 Hemi, max tow) '11-1810,620 lbfits, loaded, with 10% margin
Ram 2500 (6.7 Cummins HO) '19-2620,000 lbfits, loaded, with 10% margin
Ram 2500 (6.7 Cummins) '11-1817,980 lbfits, loaded, with 10% margin
Ram 3500 (6.7 Cummins DRW, gooseneck) '13-1831,210 lbfits, loaded, with 10% margin
Ram 3500 (6.7 Cummins HO DRW, gooseneck) '25-2636,610 lbfits, loaded, with 10% margin
Ram 3500 (6.7 Cummins HO DRW, gooseneck) '19-2437,090 lbfits, loaded, with 10% margin
Rivian R1S '22-267,700 lbfits, loaded, with 10% margin
Rivian R1T '22-2611,000 lbfits, loaded, with 10% margin
Tesla Cybertruck '24-2611,000 lbfits, loaded, with 10% margin
Toyota Sequoia (i-Force Max, tow pkg) '23-269,520 lbfits, loaded, with 10% margin
Toyota Tundra (5.7 V8, tow pkg) '11-2110,200 lbfits, loaded, with 10% margin
Toyota Tundra (i-Force Max, tow pkg) '22-2612,000 lbfits, loaded, with 10% margin
The 32it doesn't fit
  • Chevrolet Traverse (tow pkg) '18-26 — over by ~1,797 lb loaded
  • Chrysler Pacifica '17-26 — over by ~3,057 lb loaded
  • Ford Bronco 4-dr (2.7 EcoBoost, tow pkg) '21-26 — over by ~2,247 lb loaded
  • Ford Explorer (3.0 EcoBoost, tow pkg) '20-26 — over by ~1,257 lb loaded
  • Ford Maverick (2.0 EcoBoost, 4K tow pkg) '22-26 — over by ~2,697 lb loaded
  • Ford Transit (HD tow pkg) '15-26 — over by ~87 lb loaded
  • GMC Acadia (tow pkg) '20-26 — over by ~1,797 lb loaded
  • Honda Odyssey '18-26 — over by ~3,147 lb loaded
  • Honda Passport (AWD) '19-26 — over by ~1,797 lb loaded
  • Honda Pilot (AWD, tow pkg) '16-26 — over by ~1,797 lb loaded
  • Honda Ridgeline (AWD) '17-26 — over by ~1,797 lb loaded
  • Hyundai Palisade (tow pkg) '20-26 — over by ~1,797 lb loaded
  • Hyundai Santa Cruz (2.5T AWD) '22-26 — over by ~1,797 lb loaded
  • Jeep Grand Cherokee (WL, tow pkg) '22-26 — over by ~717 lb loaded
  • Jeep Wrangler Unlimited 4-dr (tow pkg) '18-26 — over by ~3,147 lb loaded
  • Kia Telluride (tow pkg) '20-26 — over by ~1,347 lb loaded
  • Mazda CX-90 (3.3 turbo, tow pkg) '24-26 — over by ~1,797 lb loaded
  • Nissan Pathfinder (tow pkg) '22-26 — over by ~897 lb loaded
  • Ram ProMaster '14-26 — over by ~77 lb loaded
  • Subaru Ascent '19-26 — over by ~1,797 lb loaded
  • Subaru Outback (XT / Wilderness) '20-26 — over by ~3,147 lb loaded
  • Tesla Model X (tow pkg) '16-26 — over by ~1,797 lb loaded
  • Tesla Model Y (tow pkg) '21-26 — over by ~3,147 lb loaded
  • Toyota 4Runner (4.0 V6) '11-24 — over by ~1,797 lb loaded
  • Toyota 4Runner (i-Force Max) '25-26 — over by ~897 lb loaded
  • Toyota Grand Highlander (i-Force Max) '24-26 — over by ~1,797 lb loaded
  • Toyota Highlander (tow pkg) '20-26 — over by ~1,797 lb loaded
  • Toyota Land Cruiser (i-Force Max) '24-26 — over by ~897 lb loaded
  • Toyota Sienna '21-26 — over by ~3,147 lb loaded
  • Toyota Tacoma (i-Force Max, tow pkg) '24-26 — over by ~447 lb loaded
  • Toyota Tacoma (V6, tow pkg) '16-23 — over by ~177 lb loaded
  • Volkswagen Atlas (tow pkg) '18-26 — over by ~1,797 lb loaded
THE SPECS
Length22.8 ft
Height (incl. A/C)10.9 ft
Width8.0 ft
GVWR6,548 lb
Dry weight5,047 lb
Dry tongue weight548 lb
Sleeps8
Slide-outs1
Axles2
Fresh water54 gal
Grey water30 gal
Black water30 gal
Awning15 ft

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

WHERE PEOPLE SLEEP
  • 1× Front drop-down tent-end queen with heated mattress(Permanent)60×80
  • 1× Rear drop-down tent-end queen with heated mattress(Permanent)60×80
  • 1× Booth dinette converts to a bed(Convertible)—
  • 1× Sofa in the slide; 60in hide-a-bed was the factory option(Convertible)—
HOW IT'S BUILT — 5/5
WallsAzdel composite
FrameAluminum
RoofWalk-on
UnderbellyEnclosed

Forest River (Better tier): Azdel composite panels, six-sided aluminum frame and a laminated walkable roof, with square bunk ends and permanently attached tents backed by a five-year tent warranty — the best-built hybrid on the market alongside its Flagstaff Shamrock twin.

YEAR BY YEAR — WHAT CHANGED
YEARSGVWRDRYMSRP
2008–156,548 lb5,047 lb$46,255
2021–236,548 lb5,047 lb$46,255
20226,548 lb5,095 lb$46,255
  • 2008Introduced
  • 2016Lightest published hitch weight of the run at about 504 lb
  • 2019Fresh tank grows to 54 gal; hitch settles at 548 lb
  • 2021UVW 5,047 / CCC 1,501; 22ft 10in closed and 27ft 2in open
  • 2022UVW up to 5,095 lb, hitch 556 lb
  • 2023Final model year
  • 2023Final model year — by 2026 the Roo range is down to the 233S and 235S
FINDING ONE

Common — usually several for sale within a day’s drive. Why: Forest River is a volume manufacturer; 16-year production run; an uncommon body style. Estimated from build volume and production span — not a count of live listings.

THE READ

A hard-sided trailer that sleeps eight and still tows at 22ft 10in closed — the classic Roo trade: canvas ends you have to dry out, in exchange for a floorplan nothing else matches.

OTHER ROCKWOOD ROO FLOORPLANS
17 · 4,394 lb · sleeps 617E · 5,418 lb · sleeps 6183 · 5,730 lb · sleeps 819 · 5,714 lb · sleeps 819L · 7,332 lb · sleeps 821BD · 6,333 lb · sleeps 621BH · 4,856 lb · sleeps 721DK · 5,784 lb · sleeps 621RS · 5,450 lb · sleeps 821SSL · 7,480 lb · sleeps 8232 · 6,409 lb · sleeps 8233 · 5,978 lb · sleeps 10233S · 6,678 lb · sleeps 10235S · 6,926 lb · sleeps 8the whole line →
Is the 21SS 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 and watch the whole market re-rank around them. Nothing gets hidden, everything gets explained.

Rank it against your setup →

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