Farmhouse sink, loft
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2025 Forest River Sandpiper 3990FL
UsedStock #UDAB047445
Listing price
2025 Sandpiper 3990FL
Other floor plans with a similar body style, feature mix, and price range, prioritizing other manufacturers and brands.
The 3990FL is built around a front living room that actually feels like one. Panoramic windows, a fireplace, and a 50" smart TV anchor the space, while the kitchen earns its keep with a farmhouse sink, solid surface countertops, a gas cooktop, and a proper island. A full loft with dedicated stairs adds real sleeping space without the awkwardness of a ladder, and the rear King bed comes with a walk-in shower and enough slide-out real estate to make the bedroom feel residential. Practical touches like an automatic leveling system, 200W roof solar, washer/dryer prep, and dual ducted air conditioners show this rig is set up for extended stays. Not just weekends.
Length
43 ft 6 in
Dry weight
12,439 lbs
GVWR
15,375 lbs
Sleeps
9
Many factors play into a unit's listing price and what you should pay. This guide provides a ballpark estimate, but it does not factor in your exact scenario or how different listings are equipped.
$51,987 – $61,599
This unit is ranked 2 of 4 by asking price in this group.
The listing price on this unit has changed 2 times.
See the complete price timeline and the rest of this unit's pricing insights.
Rocky Ridge RV
Nacogdoches, TX
Sells faster than 83% of US RV dealers
Compared with 1,115 dealers nationwide
The 2025 Forest River Sandpiper 3990FL stands out with 5 slideouts and a 43.5 ft length, delivering expansive interior space for the whole family. The Center Kitchen floorplan with Kitchen Island pairs a family friendly layout with a total fresh water capacity of 50 gallons, total gray water capacity of 80 gallons, and total black water capacity of 50 gallons. It rides on an 8 ft wide body and 13.33 ft tall profile, with an unloaded vehicle weight of 12,439 pounds and a cargo carrying capacity of 2,936 pounds, while hitch weight is 2,825 pounds and GVWR is 15,375 pounds. An impressive 20 ft awning and a 9 sleeper capacity round out the features you’ll love when you experience the Forest River Sandpiper firsthand; view the Forest River Sandpiper at Rocky Ridge RV.
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