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Dutchmen Infinity 3870FK

Fifth wheelbuilt 2012–13Mixed build tierFindable on the used market
WHAT ONE COSTS
$38,300est. used (2013, 13 yr old)

Sticker was $82,143 in 2013. Out of production since 2013, so the used market is the only way to buy one. Estimate assumes a 2013 unit.

WHAT IT WEIGHS BEHIND YOUR TRUCK
~13,891 lbestimated as towed, for 2 people

dry weight 12,516 lb + fresh water (69 gal, full) 575 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 around15,435 lb (10% margin)
GVWR (the sticker maximum)15,500 lb
Tongue weight, loaded~2,724 lb (20%)
Cargo capacity2,984 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 3870FK'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
Length41.5 ft
Height (incl. A/C)12.8 ft
GVWR15,500 lb
Dry weight12,516 lb
Dry tongue weight2,454 lb
Cargo capacity2,984 lb
Sleeps6
Slide-outs5
Axles2
Fresh water69 gal
Grey water96 gal
Black water48 gal
Air conditioning15,000 BTU

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

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

Dutchmen (Mixed tier): Infinity

YEAR BY YEAR: WHAT CHANGED
YEARSGVWRDRYMSRP
201215,500 lb12,516 lb$82,143
201315,500 lb12,516 lb$82,143
  • 2012Introduced
  • 2013Grey capacity raised to 144 gal; final year
FINDING ONE

Findable: a few listed nationwide most weeks. Why: Dutchmen is a volume manufacturer; only 2 model years; 13 years out of production. Estimated from build volume and production span, not a count of live listings.

OUR TAKE

Five-slide front-kitchen plan: the cook gets the front windows. GVWR derived as dry plus cargo capacity.

OTHER INFINITY FLOORPLANS
3000RL · 15,516 lb · sleeps 43210RE · 15,500 lb · sleeps 43250RL · 15,500 lb · sleeps 43400RL · 15,500 lb · sleeps 43470RE · 15,500 lb · sleeps 43520MS · 15,500 lb · sleeps 43570RL · 15,500 lb · sleeps 43610RL · 15,500 lb · sleeps 43640RL · 15,500 lb · sleeps 43710BH · 16,800 lb · sleeps 103750FL · 15,500 lb · sleeps 63800FB · 15,500 lb · sleeps 43810 · 16,800 lb · sleeps 63850RL · 15,500 lb · sleeps 4the whole line →
Find one for sale

Live listings for the 3870FK 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 Infinity line ↗

Is the 3870FK 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.