2027 Forest River Sierra 3710HBFB vs 4003MB
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Key differences
Both are 2027 Fifth wheel models from the Forest River Sierra line. Here's how they differ, from manufacturer specifications.
- The 3710HBFB is 1′ 2″ longer: 43′ 11″ vs 42′ 9″.
- The 4003MB is 330 lb lighter unloaded: 13,069 vs 13,399 lb.
- The 3710HBFB has a 1,855 lb higher GVWR: 15,000 vs 13,145 lb.
- The 4003MB lists 1,475 lb more cargo capacity: 3,076 vs 1,601 lb.
- The 4003MB has a 205 lb lighter hitch weight: 2,145 vs 2,350 lb.
- Both have 4 slide-outs.
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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
43′ 11″
42′ 9″
Exterior width
8′ 5″
8′ 5″
Exterior height
13′ 4″
13′ 5″
Shipping / unloaded weight
13,399 lb
13,069 lb
GVWR
15,000 lb
13,145 lb
Listed cargo capacity
1,601 lb
3,076 lb
Listed hitch weight
2,350 lb
2,145 lb
LIVING & SLEEPING
Sleeping capacity
—
—
Slide-outs
4
4
Main bed
Not verified
Not verified
Bunk beds
✓ Yes
✓ Yes
Dinette
Not verified
Not verified
Bathroom
Not verified
Not verified
Refrigerator
Not verified
Not verified
TANKS & EVERYDAY FEATURES
Fresh water
70 gal
70 gal
Gray water
104 gal
156 gal
Black water
104 gal
52 gal
Awning length
10′ 6″ & 14′ 0″
20′ 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
Not verified
SOURCES & VERIFICATION
Weight basis
Manufacturer unloaded vehicle weight
Manufacturer unloaded vehicle weight
Source checked
2026-10-22 Manufacturer ↗
2026-10-22 Manufacturer ↗
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Choose from 2,283 RVs by Forest River, Keystone, Coachmen, Jayco and 19 other manufacturers. Add up to six to see their floorplans and specifications together.
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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