2024 Grand Design Momentum 399TH vs 2025 Heartland Cyclone 4005

Detailed Comparison

The 2024 Grand Design Momentum 399TH and 2025 Heartland Cyclone 4005 represent two compelling choices for RV enthusiasts. Let's break down what sets them apart.

Starting with size, the Grand Design Momentum 399TH measures 28.0 ft long and tips the scales at 8,300 lbs dry weight. The Heartland Cyclone 4005 comes in at 26.0 ft with a dry weight of 13,000 lbs.

Capacity-wise, expect to sleep 9 in the Grand Design Momentum 399TH versus 10 in the Heartland Cyclone 4005. With 0 and 1 slide-outs respectively, the parked floor plans differ significantly.

Tank capacities are a key off-grid consideration. The Grand Design Momentum 399TH carries 68 gal of fresh water, 70 gal gray, and 50 gal black. The Heartland Cyclone 4005 offers 52 gal fresh, 70 gal gray, and 47 gal black. The Grand Design Momentum 399TH has the edge for extended dry camping.

Budget-wise, the Heartland Cyclone 4005 is listed at $56,000 compared to $61,000 for the Grand Design Momentum 399TH.

For family camping trips, the larger floor plan and additional berths make a real difference. For boondocking, the model with superior solar and battery setup will keep you comfortable off the grid longer.

Ultimately, both rigs have their merits — test drive each one and see which floor plan speaks to your lifestyle.