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Forest River Sandpiper 391FLRB

Fifth wheelbuilt 2022–24Mixed build tierFindable on the used market
WHAT ONE COSTS
$79,200est. used (2024, 2 yr old)

Sticker was $111,848 in 2022. Out of production since 2024, so the used market is the only way to buy one. Estimate assumes a 2024 unit.

WHAT IT WEIGHS BEHIND YOUR TRUCK
~14,226 lbestimated as towed, for 2 people

dry weight 13,009 lb + fresh water (50 gal, full) 417 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 around15,810 lb (10% margin)
GVWR (the sticker maximum)16,009 lb
Tongue weight, loaded~2,799 lb (20%)
WHICH TOW VEHICLES IT FITS: 19 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 391FLRB's published weights changed mid-run. Fifth wheels also need a pickup bed and are held to the fifth-wheel rating where published.

VEHICLETOW RATINGVERDICT
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
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) '17-1932,500 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) '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
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
The 76it doesn't fit

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

THE SPECS
Length43.5 ft
Height (incl. A/C)13.4 ft
Width8.0 ft
Interior height7.0 ft
GVWR16,009 lb
Dry weight13,009 lb
Dry tongue weight2,560 lb
Sleeps4
Slide-outs5
Axles2
Fresh water50 gal
Grey water104 gal
Black water52 gal
Awning20 ft

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

WHERE PEOPLE SLEEP
  • 1× Rear RV king bed(Permanent)72×80
  • 2× Dinette and sofas convert to beds(Convertible)—
HOW IT'S BUILT: 4/5
WallsLaminated fiberglass
FrameAluminum
RoofWalk-on
UnderbellyEnclosed

Forest River (Mixed tier): Forest River's volume fifth-wheel platform - genuinely welded-aluminum laminated construction with mainstream-brand QC, nothing more.

YEAR BY YEAR: WHAT CHANGED
YEARSGVWRDRYMSRP
202214,175 lb11,554 lb$111,848
2023–2416,009 lb13,009 lb$111,848
  • 2022Introduced under Sandpiper Luxury
  • 2023GVWR raised to 16,009 lb
  • 2024Discontinued
FINDING ONE

Findable: a few listed nationwide most weeks. Why: Forest River is a volume manufacturer. Estimated from build volume and production span, not a count of live listings.

OUR TAKE

Sandpiper Luxury front-living plan with a rear bath, retired after 2024.

OTHER SANDPIPER FLOORPLANS
2990TRIK · 12,729 lb · sleeps 6321RL · 14,175 lb · sleeps 63220RL · 12,729 lb · sleeps 63330BH · 13,769 lb · sleeps 63370RLS · 13,560 lb · sleeps 43440BH · 14,075 lb · sleeps 83550BH · 15,500 lb · sleeps 83550FL · 13,684 lb · sleeps 63660MB · 14,115 lb · sleeps 13368FBDS · 15,500 lb · sleeps 43710HBFB · 15,500 lb · sleeps 7372LOK · 15,500 lb · sleeps 63738H · 15,500 lb · sleeps 83770FL · 14,175 lb · sleeps 6the whole line →
Find one for sale

Live listings for the 391FLRB 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 Sandpiper line ↗

Is the 391FLRB 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.