# Heartland Big Country 3900MO

3900MO is a fifth wheel floor plan by Big Country (Heartland).

## Specs (2024 model year)

| Spec | Value |
| --- | --- |
| Length | 42 ft 3 in |
| Sleeps | 8 |
| Slide-outs | 0 |
| Dry weight | 13,885 lbs |
| GVWR | 16,500 lbs |
| MSRP | $122,504 |

## Model years

2024. Year-specific specs: `https://rvenvy.com/fifth-wheel-trailers/heartland/big-country/3900mo?year={year}`

## Overview

What makes the 3900MO stand out is how well it separates living from sleeping — the King bed anchors the front, a dedicated office sits mid-coach, and the rear living area wraps up with an entertainment setup and rear window that opens the space up nicely. The loft is the sleeper feature here (literally): it flexes as extra sleeping space or a quiet workspace away from the main living area, which is a rare find in this class. Back in the kitchen, a farmhouse sink and residential fridge give it a homier feel than most fifth wheels, and the fireplace makes the rear living area genuinely cozy. Heartland added ABS brakes and a sway system for 2024, which is a meaningful upgrade for anyone towing something this size.

## Floor plan tags

loft, desk, front bedroom, rear living area, mid office

## Inventory

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

Floor plan diagram: https://images.rvenvy.com/dd0053dea32d8fa37a8ce41a324902e24d4829e08c53ea11343da6cbad7cff2d/1024.webp

Canonical page: https://rvenvy.com/fifth-wheel-trailers/heartland/big-country/3900mo