# Forest River Sierra 3900HBLR

3900HBLR is a fifth wheel floor plan by Sierra (Forest River).

## Specs (2026 model year)

| Spec | Value |
| --- | --- |
| Length | 42 ft 9 in |
| Sleeps | 3 |
| Slide-outs | 3 |
| Dry weight | 13,284 lbs |
| GVWR | 16,085 lbs |

## Model years

2026, 2025. Year-specific specs: `https://rvenvy.com/fifth-wheel-trailers/forest-river/sierra/3900hblr?year={year}`

## Inventory

27 units currently for sale priced $65,660 to $99,995: https://rvenvy.com/fifth-wheel-trailers/forest-river/sierra/3900hblr/inventory

Floor plan diagram: https://images.rvenvy.com/c1d9641d5d844f470d3aadacd894c84430e93b27655974e1004fb7094528a4e3/1024.webp

Canonical page: https://rvenvy.com/fifth-wheel-trailers/forest-river/sierra/3900hblr