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Toy Hauler

Grand Design RV Momentum M-Class 398m

Grand Design RV Momentum M-Class 398m

Compare specs across all model years (2016–2025)

10
Model Years
12
Sleeps
43' 10"
Length
19,950
Avg GVWR
Our Recommendation
Which Year Should You Buy?
2016 Momentum M-Class 398m Best Choice

Lightest GVWR (19,500 lbs) makes it towable by more vehicles. Highest Mint Score (27.4).

View 2016 Full Specs & Tow Guide →

What Changed Year-Over-Year

2024 2025

More Compact

Length changed from 45' 7" to 43' 10".

2023 2024

Length Increased

Length changed from 43' 11" to 45' 7".

2022 2023

Tank Capacity Change

Fresh water capacity changed from 155 to 140 gallons.

All Model Years

Can Your Vehicle Tow the Momentum M-Class 398m?

Enter your truck specs to see if any of these model years fit your towing capacity—and which year gives you the most safety margin.

View Towing Calculator
Tip: Click a year to see the full specs, tow guidance, and recommended gear for that model year.

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