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Heartland Gateway 3660 TB

Fifth wheelbuilt 2014–16Mixed build tierFindable on the used market
WHAT ONE COSTS
$35,800est. used (2016, 10 yr old)

Sticker was $67,273 in 2016. Out of production since 2016, so the used market is the only way to buy one. Estimate assumes a 2016 unit.

WHAT IT WEIGHS BEHIND YOUR TRUCK
~14,172 lbestimated as towed, for 2 people

dry weight 12,880 lb + fresh water (59 gal, full) 492 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 around15,750 lb (10% margin)
GVWR (the sticker maximum)15,500 lb
Tongue weight, loaded~2,575 lb (18%)
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 3660 TB'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
Length40.9 ft
Height (incl. A/C)13.2 ft
Width8.0 ft
GVWR15,500 lb
Dry weight12,880 lb
Dry tongue weight2,340 lb
Sleeps6
Axles2
Fresh water59 gal
Grey water40 gal
Black water80 gal

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

WHERE PEOPLE SLEEP
  • 1× Queen bed, front bedroom(Permanent)60×80
  • 2× Twin bunks(Permanent)—
  • 1× Dinette(Convertible)—
HOW IT'S BUILT: 3/5
WallsLaminated fiberglass
FrameAluminum
RoofStandard
UnderbellyEnclosed

Heartland (Mixed tier): Gateway

YEAR BY YEAR: WHAT CHANGED
  • 2014Introduced
  • 2017Dropped
FINDING ONE

Findable: a few listed nationwide most weeks. Why: Heartland is a volume manufacturer; 10 years out of production. Estimated from build volume and production span, not a count of live listings.

OUR TAKE

Twin-bunk family plan; the odd one out with only 40 gal of grey capacity.

OTHER GATEWAY FLOORPLANS
3200 RLS · 16,000 lb · sleeps 43230 CK · 16,000 lb · sleeps 43300 ML · 14,000 lb · sleeps 43400 SE · 14,000 lb · sleeps 43500 RE · 14,000 lb · sleeps 43650 BH · 15,500 lb · sleeps 83700 PTB · 15,500 lb · sleeps 83700 RD · 16,000 lb · sleeps 63750 PT · 15,500 lb · sleeps 83810 RLB · 16,000 lb · sleeps 83900 MB · 16,000 lb · sleeps 83900 SE · 15,500 lb · sleeps 43905 FLG · 18,000 lb · sleeps 63910 RK · 16,000 lb · sleeps 6the whole line →
Find one for sale

Live listings for the 3660 TB 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 Gateway line ↗

Is the 3660 TB 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.