# Grand Design Momentum 399TH

> Toy hauler, side patio, bath and a half, bar seating

399TH is a fifth wheel floor plan by Momentum (Grand Design).

## Specs (2024 model year)

| Spec | Value |
| --- | --- |
| Length | 44 ft 9 in |
| Sleeps | 9 |
| Slide-outs | 3 |
| Dry weight | 15,900 lbs |
| GVWR | 20,000 lbs |
| MSRP | $153,518 |

## Model years

2024, 2023, 2022, 2021. Year-specific specs: `https://rvenvy.com/fifth-wheel-trailers/grand-design/momentum/399th?year={year}`

## We like

- Side patio

## Things to consider

- TV doesn't face couch
- Tight quarters in bathrooms

## Floor plan tags

bath and a half, walk-thru bath, loft, bar seating, toy hauler, front bedroom, side patio

## Inventory

12 units currently for sale priced $59,888 to $111,324: https://rvenvy.com/fifth-wheel-trailers/grand-design/momentum/399th/inventory

Floor plan diagram: https://images.rvenvy.com/d35b7e91853645745d1eaeadcd778ed28d13e4c86150b2a30d2df0cdcfba3dd2/1024.webp

Canonical page: https://rvenvy.com/fifth-wheel-trailers/grand-design/momentum/399th