2026 Forest River Riverstone 421FK vs Heartland Bighorn 39FL
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Key differences
Both are 2026 Fifth wheel models. Here's how they differ, from manufacturer specifications.
- The Forest River Riverstone 421FK is 2″ longer: 44′ vs 43′ 10″.
- The Heartland Bighorn 39FL is 3,141 lb lighter unloaded: 15,645 vs 18,786 lb.
- The Forest River Riverstone 421FK has a 6,005 lb higher GVWR: 24,000 vs 17,995 lb.
- The Forest River Riverstone 421FK lists 2,864 lb more cargo capacity: 5,214 vs 2,350 lb.
- The Heartland Bighorn 39FL has a 545 lb lighter hitch weight: 3,090 vs 3,635 lb.
- The Forest River Riverstone 421FK holds 4 gal more fresh water: 79 vs 75 gal.
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YOUR SHORTLIST
Floorplan
PRICING
Manufacturer price (USD)
Not verified
Not verified
Lowest tracked dealer price (USD)
No recently verified dealer price
No recently verified dealer price
Est. monthly payment (USD)
No verified price to estimate from
No verified price to estimate from
DIMENSIONS & WEIGHTS
Exterior length
44′ 0″
43′ 10″
Exterior width
8′ 6″
8′ 6″
Exterior height
13′ 4″
13′ 3″
Shipping / unloaded weight
18,786 lb
15,645 lb
GVWR
24,000 lb
17,995 lb
Listed cargo capacity
5,214 lb
2,350 lb
Listed hitch weight
3,635 lb
3,090 lb
LIVING & SLEEPING
Sleeping capacity
—
4
Slide-outs
6
—
Main bed
Not verified
Not verified
Bunk beds
Not verified
Not verified
Dinette
Not verified
Not verified
Bathroom
Not verified
Not verified
Refrigerator
Not verified
Not verified
TANKS & EVERYDAY FEATURES
Fresh water
79 gal
75 gal
Gray water
120 gal
74 gal
Black water
40 gal
74 gal
Awning length
16′ 0″ & 16′ 0″
14′ 0″
Shore power / electrical service
Not verified
Not verified
Solar equipment
Not verified
Not verified
Outdoor kitchen
Not verified
Not verified
Washer/dryer prep
Not verified
Not verified
Microwave
Not verified
Not verified
Cooktop
Not verified
Not verified
Air conditioning
Not verified
Not verified
Electric fireplace
Not verified
Not verified
Backup camera
Not verified
Not verified
Propane tanks
—
—
Tire size
Not verified
215/75R17.5'H'
SOURCES & VERIFICATION
Weight basis
Manufacturer unloaded vehicle weight
Manufacturer unloaded vehicle weight
Source checked
2026-10-28 Manufacturer ↗
2026-10-28 Manufacturer ↗
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Manufacturer floorplan images © their respective manufacturers. Specs checked October 19, 2026; exact-unit labels and production options may differ. “Not verified” or a dash means we have no confirmed value. “Not listed” means the applicable manufacturer equipment was checked but does not mention the feature; it does not mean “No.” “Conflicting data” means manufacturer entries disagree. “Optional” equipment is available but is not confirmed as standard. Camera prep does not confirm an installed camera. Weights are kept separate: unloaded weight, GVWR, cargo capacity, and hitch weight. Confirm every specification for the exact model year and configuration with the manufacturer. This tool does not establish towing compatibility.
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