01 What makes it unique
The 39FL inverts the coach: the living room rides up front over the pin — the raised, windowed lounge that makes front-living plans the hosting format — with the bedroom amidships and the galley aft, and it takes five slides to open it all, the most of any Bighorn. Two 14-foot awnings cover the camp side, and the tank set runs a balanced 74 grey / 74 black under the standard 75 fresh.
The platform is the full build at maximum stretch: 12-inch I-beam drop frame, 102-inch wide-body, CoreShield 2-inch laminated walls, painted front cap, frameless windows, TrussXL truss under the limited-lifetime membrane, ThermaShield zero-degree package, dual 15,000-BTU Whisper Quiet air conditioners, tankless water heater, six-point hydraulic auto-level and the mandatory Premium Package with the GE 21-cubic-foot residential refrigerator on its 1,800-watt inverter. The printed 17,995-pound GVWR equals 15,645 dry plus 2,350 cargo exactly — the tightest margin in the line — on tandem 8,000-pound axles.
The two numbers that govern the purchase: a 3,090-pound dry pin — the heaviest in the roster, and a loaded figure that will demand a serious one-ton, likely a dually — and 2,350 pounds of cargo margin that a filled fresh tank alone cuts by a quarter. Front-living coaches are bought for how they host, and nothing else in the line hosts like this; just buy the truck first.
02 Full specifications
Dimensions
- Exterior length
- 43' 10"
- Exterior width
- 8' 6"
- Exterior height
- 12' 6"
- Interior height
- 8' 6"
Weights
- Dry / unit base weight
- 15,645 lbs
- GVWR (max loaded)
- 17,995 lbs
- Net cargo / payload (CCC)
- 2,350 lbs
- Dry pin weight
- 3,090 lbs
Capacities
- Fresh water
- 75 gal
- Grey water
- 74 gal
- Black water
- 74 gal
- Refrigerator
- GE 21 cu ft residential
Construction
- Frame
- 12″ steel I-beam · drop frame
- Sidewalls
- CoreShield 2″ laminate · high-gloss gel coat
- Front cap
- Painted fiberglass · clearcoat · LED
- Roof
- TrussXL truss · Alpha membrane (limited lifetime)
Running gear
- Axles (factory)
- 2 x 8,000
- Hitch
- Fifth wheel · dry pin 3,090 lb
- Tires
- 215/75R17.5'H'
- LP
- 90 lb total
Galley & systems
- Refrigerator
- GE 21 cu ft residential · 1,800W inverter
- A/C
- 2 × 15,000 BTU Whisper Quiet
- Water heater
- Tankless
- Furnace
- 40,000 BTU
Sleeping & layout
- Sleeps
- Up to 4 (factory)
- Primary bed
- Mid bedroom
- Layout
- Front-living five-slide — raised front lounge over the pin, mid bedroom, rear galley run, two 14-foot awnings
- Awnings & entries
- 2 · 14′ + 14′ · 1 entry (RVUSA)
03 Bighorn floorplan family
Heartland's Bighorn line — the flagship luxury fifth wheel of the relaunched range: seven 2026 floorplans, every one a 102-inch wide-body on a 12-inch steel I-beam drop frame with a painted fiberglass front cap, CoreShield laminated sidewalls in high-gloss gel coat, the ThermaShield zero-degree package with a 40,000-BTU furnace, two 15,000-BTU Whisper Quiet air conditioners, and a mandatory Premium Package that includes six-point hydraulic auto-leveling, a GE 21-cubic-foot residential refrigerator with an 1,800-watt inverter and a GE appliance suite. All seven plans are profiled in depth on the Bighorn hub with verified weights.
| Floorplan | Nominal | Sleeps | Notable |
|---|---|---|---|
| 31RL | 36 ft | 4 | Rear-living entry — shortest, lightest, friendliest pin |
| 36RK | 40 ft | 4 | Rear-kitchen plan — the galley takes the back wall |
| 38RE | 43 ft | 4 | Rear-entertainment quad-slide — most-listed; 137-gal grey |
| 37MD | 43 ft | 8 | Middle-den quad-slide — two living zones |
| 39RK | 43 ft | 4 | Rear U-kitchen, bath-and-a-half — respec’d stretch; best margin |
| 39FL | 44 ft | 4 | Front-living flagship — five slides, heaviest pin |
| 40DB | 44 ft | 8 | Two bedrooms, two full baths — the multi-family flagship |
Every Bighorn is a 102-inch wide-body on the 12-inch I-beam drop frame, and the Premium Package is mandatory — its content (hydraulic auto-level, the GE residential appliance suite with inverter, central vacuum, gel-coat sidewalls) is part of the Base MSRP shown. This is a published-GVWR-clean line: dry plus cargo equals the printed GVWR exactly on all seven plans. RVUSA and the library brochure carry an early-print weight set superseded on five plans — the current factory pages and the June-2026 dealer-network brochure agree exactly and are used throughout (the 39RK was respecified from a 40-foot-4 two-slide draft to the current 43-foot-3 three-slide build, logged). Dealer placards typically run above Base MSRP while negotiated street pricing runs below it. A fifth wheel loads its pin into the truck bed — confirm the pin weight against the tow vehicle's payload placard, not its tow rating.
04 What owners & reviewers report
Five slides
The most in the roster — the whole perimeter opens. Slide maintenance scales accordingly; the six-point hydraulic auto-level is standard support.
The heaviest pin
3,090 pounds dry over the hitch — loaded, this is dually math. The payload placard decides the truck.
The tightest margin
2,350 pounds of cargo capacity is the least in the line — full-timers should weigh the loaded coach axle by axle.
74/74 tanks
The balanced grey/black split suits the mid-bath layout — different plumbing logic than the rear-bath siblings.
05 How it compares
The rear-entertainment alternative — the lounge goes aft, the pin drops 120 pounds and the grey tank nearly doubles to 137 gallons.
The entry — 2,585 pounds lighter with the friendliest pin, for couples who host less.
The front-living luxury field — the 39FL counter is five-slide volume and the standard zero-degree package.