2024 Grand Design Momentum 399TH vs 2025 Heartland Fuel 305

Detailed Comparison

Before committing to the 2024 Grand Design Momentum 399TH or the 2025 Heartland Fuel 305, it pays to understand exactly where each one shines and where it falls short.

Dimensionally, you're looking at 28.0 ft for the Grand Design Momentum 399TH and 42.0 ft for the Heartland Fuel 305. The Heartland Fuel 305 carries an extra 3,300 lbs, which affects tow vehicle requirements and fuel economy.

The Grand Design Momentum 399TH sleeps 9 while the Heartland Fuel 305 accommodates 6. Slide-outs play a role in livability: the Grand Design Momentum 399TH has 0 and the Heartland Fuel 305 has 1.

For boondocking enthusiasts, tank sizes matter. Fresh water capacity goes to the Grand Design Momentum 399TH at 68 gallons versus 55 gallons. Solar-wise, you get 200W on the Grand Design Momentum 399TH and 350W on the Heartland Fuel 305. Battery banks are 150 Ah and 150 Ah.

At $61,000 MSRP for the Grand Design Momentum 399TH and $58,000 for the Heartland Fuel 305, the Heartland Fuel 305 saves you $3,000. With only a 5% price difference, the choice comes down to features rather than cost.

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.

Remember, the perfect RV is the one you'll actually use. Pick the one that excites you most and hit the road.