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Heartland Sundance 3700RLB

Fifth wheelbuilt 2016–19Mixed build tierFindable on the used market
WHAT ONE COSTS
$42,000est. used (2019, 7 yr old)

Sticker was $70,331 in 2018. Out of production since 2019, so the used market is the only way to buy one. Estimate assumes a 2019 unit.

WHAT IT WEIGHS BEHIND YOUR TRUCK
15,500 lbno dry weight published: its rating stands in
You want a tow rating around17,225 lb (10% margin)
GVWR (the sticker maximum)15,500 lb
WHICH TOW VEHICLES IT FITS: 18 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 3700RLB'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 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 77it doesn't fit

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

THE SPECS
Length42.1 ft
Height (incl. A/C)12.5 ft
Width8.0 ft
GVWR15,500 lb
Dry weightnot published
Sleeps8
Slide-outs3
Axles2
Air conditioning15,000 BTU
Awning18 ft

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

WHERE PEOPLE SLEEP
  • 1× front queen bed(Permanent)—
  • 1× dinette converts to a bed(Convertible)—
  • 1× hide-a-bed sofa(Convertible)—
HOW IT'S BUILT: 4/5
WallsLaminated fiberglass
FrameAluminum
RoofWalk-on
UnderbellyEnclosed

Heartland (Mixed tier): Heartland's mid-price family, all built with laminated fiberglass over welded aluminum framing: Sundance fifth wheels, the shorter half-ton-friendly Sundance XLT fifth wheels, and Sundance Ultra-Lite travel trailers.

YEAR BY YEAR: WHAT CHANGED
  • 2016Introduced
FINDING ONE

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

OUR TAKE

Rear-living-bath 42-footer that closed out the pre-2020 Sundance fifth wheel line; Heartland never published a dry weight for it.

OTHER SUNDANCE FLOORPLANS
181MB · 7,340 lb · sleeps 4189MB · 6,160 lb · sleeps 4211MB · 7,540 lb · sleeps 8221RB · 7,430 lb · sleeps 4231ML · 7,532 lb · sleeps 6241BH · 7,570 lb · sleeps 824ML · 9,500 lb · sleeps 4262RB · 7,780 lb · sleeps 6265BH · 7,748 lb · sleeps 8268RL · 7,800 lb · sleeps 6278BH · 9,460 lb · sleeps 1027MLOK · 10,400 lb · sleeps 227OKFK · 9,800 lb · sleeps 427RBSS · 9,400 lb · sleeps 4the whole line →
Find one for sale

Live listings for the 3700RLB 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 Sundance line ↗

Is the 3700RLB 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 low-confidence record: figures are inferred and should be independently verified, retrieved 2026-07.