CamperHardlyKnowHer

Forest River Rockwood Roo 21SSL

Hybridbuilt 2010–20Better build tierCommon on the used market
WHAT ONE COSTS
—price not published

The maker never published an MSRP for this floorplan. Unknown is not cheap — treat any asking price against comparable models, not against zero.

WHAT IT WEIGHS BEHIND YOUR TRUCK
~7,166 lbestimated as towed, for 2 people

dry weight 5,882 lb + fresh water (58 gal, full) 484 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 around7,965 lb (10% margin)
GVWR (the sticker maximum)7,480 lb
Tongue weight, loaded~585 lb (8% — low, watch for sway)
WHICH TOW VEHICLES IT FITS — 52 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 21SSL's published weights held steady.

VEHICLETOW RATINGVERDICT
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
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 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
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 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 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 43it doesn't fit
  • Chevrolet Colorado / GMC Canyon (2.7 Turbo HO, tow pkg) '23-26 — over by ~236 lb loaded
  • Chevrolet Colorado / GMC Canyon (2.8 Duramax) '15-22 — over by ~236 lb loaded
  • Chevrolet Traverse (tow pkg) '18-26 — over by ~2,666 lb loaded
  • Chrysler Pacifica '17-26 — over by ~3,926 lb loaded
  • Ford Bronco 4-dr (2.7 EcoBoost, tow pkg) '21-26 — over by ~3,116 lb loaded
  • Ford Explorer (3.0 EcoBoost, tow pkg) '20-26 — over by ~2,126 lb loaded
  • Ford Maverick (2.0 EcoBoost, 4K tow pkg) '22-26 — over by ~3,566 lb loaded
  • Ford Ranger (2.3 EcoBoost, tow pkg) '19-23 — over by ~416 lb loaded
  • Ford Ranger (2.7 EcoBoost, tow pkg) '24-26 — over by ~416 lb loaded
  • Ford Transit (HD tow pkg) '15-26 — over by ~956 lb loaded
  • GMC Acadia (tow pkg) '20-26 — over by ~2,666 lb loaded
  • GMC Hummer EV Pickup '22-26 — over by ~416 lb loaded
  • Honda Odyssey '18-26 — over by ~4,016 lb loaded
  • Honda Passport (AWD) '19-26 — over by ~2,666 lb loaded
  • Honda Pilot (AWD, tow pkg) '16-26 — over by ~2,666 lb loaded
  • Honda Ridgeline (AWD) '17-26 — over by ~2,666 lb loaded
  • Hyundai Palisade (tow pkg) '20-26 — over by ~2,666 lb loaded
  • Hyundai Santa Cruz (2.5T AWD) '22-26 — over by ~2,666 lb loaded
  • Jeep Gladiator (3.6 V6, max tow) '20-26 — over by ~236 lb loaded
  • Jeep Grand Cherokee (5.7 Hemi) '11-21 — over by ~686 lb loaded
  • Jeep Grand Cherokee (WL, tow pkg) '22-26 — over by ~1,586 lb loaded
  • Jeep Grand Cherokee L (5.7 Hemi) '21-26 — over by ~686 lb loaded
  • Jeep Wrangler Unlimited 4-dr (tow pkg) '18-26 — over by ~4,016 lb loaded
  • Kia Telluride (tow pkg) '20-26 — over by ~2,216 lb loaded
  • Mazda CX-90 (3.3 turbo, tow pkg) '24-26 — over by ~2,666 lb loaded
  • Mercedes-Benz Sprinter '19-26 — over by ~416 lb loaded
  • Nissan Frontier (3.8 V6, tow pkg) '22-26 — over by ~731 lb loaded
  • Nissan Pathfinder (tow pkg) '22-26 — over by ~1,766 lb loaded
  • Ram ProMaster '14-26 — over by ~946 lb loaded
  • Rivian R1S '22-26 — over by ~236 lb loaded
  • Subaru Ascent '19-26 — over by ~2,666 lb loaded
  • Subaru Outback (XT / Wilderness) '20-26 — over by ~4,016 lb loaded
  • Tesla Model X (tow pkg) '16-26 — over by ~2,666 lb loaded
  • Tesla Model Y (tow pkg) '21-26 — over by ~4,016 lb loaded
  • Toyota 4Runner (4.0 V6) '11-24 — over by ~2,666 lb loaded
  • Toyota 4Runner (i-Force Max) '25-26 — over by ~1,766 lb loaded
  • Toyota Grand Highlander (i-Force Max) '24-26 — over by ~2,666 lb loaded
  • Toyota Highlander (tow pkg) '20-26 — over by ~2,666 lb loaded
  • Toyota Land Cruiser (i-Force Max) '24-26 — over by ~1,766 lb loaded
  • Toyota Sienna '21-26 — over by ~4,016 lb loaded
  • Toyota Tacoma (i-Force Max, tow pkg) '24-26 — over by ~1,316 lb loaded
  • Toyota Tacoma (V6, tow pkg) '16-23 — over by ~1,046 lb loaded
  • Volkswagen Atlas (tow pkg) '18-26 — over by ~2,666 lb loaded
THE SPECS
Length36.3 ft
Height (incl. A/C)11.2 ft
Width8.0 ft
Interior height6.7 ft
GVWR7,480 lb
Dry weight5,882 lb
Dry tongue weight480 lb
Sleeps8
Slide-outs1
Axles2
Fresh water58 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
  • 2× Tent-end queens(Permanent)—
  • 2× Garage sofa and dinette convert(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
  • 2010Introduced
  • 2020Final model year
FINDING ONE

Common — usually several for sale within a day’s drive. Why: Forest River is a volume manufacturer; 11-year production run; an uncommon body style. Estimated from build volume and production span — not a count of live listings.

THE READ

The long-lived toy-hauler Roo - eleven model years. GVWR derived; no published MSRP found.

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 821SS · 6,548 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 21SSL 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.