# Forest River Sierra 3660MB

Sierra 3660MB is a fifth wheel floor plan by Forest River.

## Specs (2023 model year)

| Spec | Value |
| --- | --- |
| Length | 41 ft 4 in |
| Sleeps | 13 |
| Slide-outs | 4 |
| Dry weight | 11,659 lbs |
| GVWR | 14,115 lbs |
| MSRP | $85,863 |

## Model years

2023, 2022, 2021. Year-specific specs: `https://rvenvy.com/fifth-wheel-trailers/forest-river/sierra/3660mb?year={year}`

## Overview

The Forest River Sierra 3660MB packs a lot of ingenuity into one floor plan: a mid-bunk section for the kids, a private front bedroom, a rear living area, and a kitchen island that makes the space feel more like a home than a trailer. Owners consistently praise how livable the Sierra 3660MB feels day-to-day, and more than one has noted it tows more easily than its size suggests. The loft adds yet another sleeping or hangout zone, which is part of why this floor plan can comfortably sleep 13. One thing worth knowing going in: RV Insider reviews and owner accounts both flag factory fit-and-finish as variable, so a thorough pre-delivery inspection is a smart move with the Sierra 3660MB.

## Floor plan tags

bunk beds, loft, mid bunk, front bedroom, rear living area

## Inventory

No units currently for sale. Search similar inventory: https://rvenvy.com/inventory

Floor plan diagram: https://images.rvenvy.com/a02d3f684f6e917f0b743f5b007c791df2285763ce40c9073ac186aafccba6c7/1024.webp

Canonical page: https://rvenvy.com/fifth-wheel-trailers/forest-river/sierra/3660mb