2024 Grand Design Momentum 399TH vs 2024 Grand Design Momentum G-Class 25G

Detailed Comparison

Both the 2024 Grand Design Momentum 399TH and the 2024 Grand Design Momentum G-Class 25G have loyal followings, and for good reason. Here's an objective look at how they measure up.

The Grand Design Momentum 399TH measures 28.0 ft in length at 8,300 lbs, compared to the Grand Design Momentum G-Class 25G's 30.0 ft and 10,100 lbs. GVWR ratings sit at 11,900 lbs and 14,200 lbs respectively.

The Grand Design Momentum 399TH sleeps 9 while the Grand Design Momentum G-Class 25G accommodates 6.

For boondocking enthusiasts, tank sizes matter. Fresh water capacity goes to the Grand Design Momentum G-Class 25G at 95 gallons versus 68 gallons. Solar-wise, you get 200W on the Grand Design Momentum 399TH and 250W on the Grand Design Momentum G-Class 25G. Battery banks are 150 Ah and 100 Ah.

At $61,000 MSRP for the Grand Design Momentum 399TH and $41,000 for the Grand Design Momentum G-Class 25G, the Grand Design Momentum G-Class 25G saves you $20,000.

If you're traveling with a family, look for the model with more sleeping positions and better storage. Boondockers: look at the fresh water capacity and solar/battery systems — they determine how long you can stay out. For the full-time RV lifestyle, every gallon of tank capacity and every inch of counter space counts.

Take these specs as a starting point, then go see them in person — there's no substitute for stepping inside.