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Heartland Big Country 3703RK

Fifth wheelbuilt 2021–23Mixed build tierFindable on the used market
WHAT ONE COSTS
$78,700est. used (2023, 3 yr old)

Sticker was $122,306 in 2022. Out of production since 2023, so the used market is the only way to buy one. Estimate assumes a 2023 unit.

WHAT IT WEIGHS BEHIND YOUR TRUCK
~14,482 lbestimated as towed, for 2 people

dry weight 13,140 lb + fresh water (65 gal, full) 542 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 around16,095 lb (10% margin)
GVWR (the sticker maximum)16,500 lb
Tongue weight, loaded~3,064 lb (21%)
Cargo capacity3,312 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 3703RK'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
Length41.1 ft
Height (incl. A/C)13.3 ft
Width8.0 ft
GVWR16,500 lb
Dry weight13,140 lb
Dry tongue weight2,780 lb
Cargo capacity3,312 lb
Sleeps6
Slide-outs4
Axles2
Fresh water65 gal
Grey water90 gal
Black water90 gal
Air conditioning30,000 BTU
Awning18 ft

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

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

Heartland (Mixed tier): Heartland's near-luxury fifth wheel - Azdel laminated walls, a 12 in. powder-coated steel I-beam frame and dual 15,000 BTU A/C - built from 2007 through model year 2024.

YEAR BY YEAR: WHAT CHANGED
  • 2021Introduced
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

Quad-slide rear-kitchen plan with dual 90 gal waste tanks.

OTHER BIG COUNTRY FLOORPLANS
3070RE · 15,500 lb · sleeps 43150RL · 15,500 lb · sleeps 43155RLK · 16,000 lb · sleeps 43200RLK · 16,000 lb · sleeps 43450TS · 15,500 lb · sleeps 43460GK · 16,500 lb · sleeps 43500SS · 16,500 lb · sleeps 43502RKI · 16,500 lb · sleeps 43560SS · 16,000 lb · sleeps 63650RL · 15,500 lb · sleeps 43700FL · 16,000 lb · sleeps 43702FB · 16,250 lb · sleeps 43705FB · 16,500 lb · sleeps 43800FL · 16,000 lb · sleeps 4the whole line →
Find one for sale

Live listings for the 3703RK 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 Big Country line ↗

Is the 3703RK 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 manufacturer spec sheets, retrieved 2026-07.