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Prime Time Sanibel 3900

Fifth wheelbuilt 2015–17Mixed build tierFindable on the used market
WHAT ONE COSTS
$44,800est. used (2017, 9 yr old)

Sticker was $77,105 in 2015. Out of production since 2017, so the used market is the only way to buy one. Estimate assumes a 2017 unit.

WHAT IT WEIGHS BEHIND YOUR TRUCK
~14,499 lbestimated as towed, for 2 people

dry weight 13,165 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 around16,110 lb (10% margin)
GVWR (the sticker maximum)15,441 lb
Tongue weight, loaded~2,798 lb (19%)
Cargo capacity2,276 lb
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 3900's published weights held steady. 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
Length41.8 ft
Height (incl. A/C)13.3 ft
Width8.0 ft
GVWR15,441 lb
Dry weight13,165 lb
Dry tongue weight2,541 lb
Cargo capacity2,276 lb
Sleeps6
Slide-outs5
Axles2
Fresh water64 gal
Grey water90 gal
Black water50 gal
Air conditioning15,000 BTU

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

WHERE PEOPLE SLEEP
  • 1× Front king bed(Permanent)—
  • 2× Front-living sofas(Convertible)—
HOW IT'S BUILT: 4/5
WallsLaminated fiberglass
FrameAluminum
RoofWalk-on
UnderbellyEnclosed

Prime Time (Mixed tier): Forest River

YEAR BY YEAR: WHAT CHANGED
  • 2015Introduced
  • 2017Final year
FINDING ONE

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

OUR TAKE

Five-slide plan with a 28 ft awning; three model years.

OTHER SANIBEL FLOORPLANS
3102RSWB · 13,817 lb · sleeps 43102WB · 13,817 lb · sleeps 43202WB · 13,788 lb · sleeps 43250 · 15,441 lb · sleeps 43402WB · 14,190 lb · sleeps 434LOUNGE · 14,499 lb · sleeps 43500 · 15,441 lb · sleeps 43600 · 15,441 lb · sleeps 43602DSWB · 15,500 lb · sleeps 63650 · 16,388 lb · sleeps 43702WB · 14,298 lb · sleeps 43750 · 15,984 lb · sleeps 43800 · 16,250 lb · sleeps 63802FLWB · 15,500 lb · sleeps 6the whole line →
Find one for sale

Live listings for the 3900 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 Sanibel line ↗

Is the 3900 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.