2026 Forest River Sierra 3900HBLR specs & floorplan
Fifth wheel · 2026 model year
Explore the 2026 Forest River Sierra 3900HBLR specification sheet: dimensions, weights, sleeping arrangements, tank capacities and available equipment.
Compare this to other models →Source checked 2026-10-28. View manufacturer specifications ↗
Manufacturer pricing
MSRP not verified
Price details
No model-specific price was found in the manufacturer information checked.
Price source checked .
Prices are not estimated from other models, model years or dealer asking prices.
© Forest River, Inc.. Illustration may show optional equipment.
At a glance
- Exterior length
- 42′ 9″
- Unloaded weight
- 13,284 lb
- GVWR
- 16,085 lb
Weight basis: Manufacturer unloaded vehicle weight.
Dealer pricing · USD
Dealer prices & price history
Advertised price history
Price history starts with our first observation. A trend will appear after more daily checks.
Dealer prices
No recently verified advertised prices for this model. This does not mean no dealers have it in stock.
About these prices
- New units only. Prices are advertised offers from a small sample of dealers, not an exhaustive nationwide search or an out-the-door quote. Options and equipment vary by unit.
- Listings are re-checked every 48 hours, and the lowest-priced unit is re-checked daily. Initial collection and source failures can delay updates.
- Price history observations begin when tracking starts; earlier discounts are not reconstructed. History includes listings that may no longer be available.
Payment calculator
Adjust price, down payment, rate and termTap to adjust—/moEnter a price to estimate a payment
- Amount financed
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About this estimate
- An estimate for comparison only, not a loan offer. Your rate and term depend on credit, lender, down payment and the RV.
- Sales tax is applied to the price minus the trade-in value. Some states tax RVs differently.
- Tax and fees are added to the amount financed.
- Typical terms used: 10 years under $25,000 financed, 15 years up to $100,000 and 20 years above.
Dimensions & weights
- Exterior length
- 42′ 9″
- Exterior width
- 8′ 0″
- Exterior height
- 13′ 4″
- Shipping / unloaded weight
- 13,284 lb
- GVWR
- 16,085 lb
- Listed cargo capacity
- 2,801 lb
- Listed hitch weight
- 2,085 lb
Living & sleeping
- Sleeping capacity
- Not verified
- Slide-outs
- 3
- Main bed
- Not verified
- Bunk beds
- Not verified
- Dinette
- Not verified
- Bathroom
- Not verified
- Refrigerator
- Not verified
Tanks & everyday features
- Fresh water
- 50 gal
- Gray water
- 136 gal
- Black water
- 104 gal
- Awning length
- 12′ 0″ & 18′ 0″
- Shore power / electrical service
- Not verified
- Solar equipment
- Not verified
- Outdoor kitchen
- Not verified
- Washer/dryer prep
- Not verified
- Microwave
- Not verified
- Cooktop
- Not verified
- Air conditioning
- Not verified
- Electric fireplace
- Not verified
- Backup camera
- Not verified
- Propane tanks
- Not verified
- Tire size
- Not verified
Sources & specification notes
View manufacturer specifications ↗ · Checked .
“Not verified” means a confirmed value is unavailable. “Not listed” does not mean a feature is absent. Optional equipment is not confirmed as installed. Check the exact model year, configuration and unit labels with the manufacturer. This specification sheet does not establish towing compatibility.
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