Skip to main content Skip to navigation

Class A motorhomes
Class C motorhomes
Class B vans
Fifth wheel trailers
Travel trailers
Pop-up campers
Advanced search
Floor plan wizard
Inventory

Browse popular layouts & features

Class A motorhomes

… with bunk beds
… with two bedrooms
… with bath and a half
… with two full bathrooms
… with bunk over cab
… with rear bathroom

Browse all features →

Class B vans

… with King size bed
… with rear twin beds
… with Murphy bed
… with rear bathroom
… with dual twin beds

Browse all features →

Class C motorhomes

… with bunk over cab
… with bunk beds
… with rear bathroom
… with rear twin beds
… with Murphy bed
… with outdoor kitchen
… with outdoor TV

Browse all features →

Fifth wheel trailers

… with bath and a half
… with two bathrooms
… with bunk beds
… with two bedrooms
… with side patio
… with rear patio
… with outdoor kitchen
… with washer/dryer
… with front living

Browse all features →

Travel trailers

… with bunk beds
… with two bedrooms
… with Murphy bed
… with outdoor kitchen
… with rear bath
… with front bedroom

Browse all features →

Popup campers

under $10k
under $15k
under 2,000 lbs
under 3,000 lbs

Browse all features →

RV dealers by metro area

Los Angeles Dallas–Fort Worth Houston Atlanta Phoenix Tampa Bay Orlando Denver Chicago Seattle Nashville Toronto Browse all metro areas →

Explore

RV floor plans
Browse inventory
Sell your RV
Dealers
Shopping tips

Company

About
Our story
Contact

Services

Dealer leads
Dealer websites & CRM
OEM advertising
Shopper insights

Join our mailing list

We don't send much, but you won't want to miss it!

Fax

The RV search engine. Find your dream RV.

We do our best to keep listing details accurate, but pricing, specifications, and availability come from third-party sources and can change without notice. We can't guarantee accuracy, so please confirm the details with the dealer before making any decisions. See something inaccurate? Contact us.

© 2026 RV Envy. All rights reserved.

For AI agentsPrivacy Terms

Momentum 398M by Grand Design for sale (1 available) | RV Envy

Home
Fifth wheel trailers
Grand Design
Momentum
398M
Inventory

Grand Design Momentum 398M exterior

Grand Design Momentum 398M for sale

1 unit for sale from $99,995

Available inventory

Year	Status	Dealer	MSRP	Sale price
2023	used	A dealer in MT MT	$109,995	$99,995		Visit listing

A dealer in MT
2023·used
$109,995$99,995

Sign up to see 1 available unit

Email address

We'll email you a link to unlock pricing and dealer info. No password needed.

Grand Design Momentum 398M overview

Key facts

MSRP: $135,743
Length: 43 ft 11 in
Max weight: 20,000 lbs
Sleeps: 11

Specs

Dimensions

Length: 43 ft 11 in
Height: 12 ft 1 in
Slideouts: 3

Tanks & capacities

Fresh water: 155 gal
Gray water: 104 gal
Black water: 52 gal

Weight & towing

Dry weight: 15,000 lbs
GVWR: 20,000 lbs
Hitch weight: 2,980 lbs

1 ton truck required

New Ford F-350, RAM 3500, Sierra 3500, or bigger

Based on overall weight and weight directly on tow vehicle's hitch and a new model tow vehicle. Please consult with a professional.

Accommodations

Sleeps: 11