2025 Grand Design Momentum G-Class 28G vs 2024 Keystone Carbon 338

Detailed Comparison

Looking at the 2025 Grand Design Momentum G-Class 28G alongside the 2024 Keystone Carbon 338? Smart move — comparing specs before you buy is the best way to ensure satisfaction.

The Grand Design Momentum G-Class 28G measures 43.0 ft in length at 12,000 lbs, compared to the Keystone Carbon 338's 28.0 ft and 15,300 lbs. GVWR ratings sit at 15,200 lbs and 19,800 lbs respectively.

For sleeping arrangements, the Grand Design Momentum G-Class 28G offers room for 10 and the Keystone Carbon 338 can handle 10. The Keystone Carbon 338 benefits from 2 slide-out(s), expanding the interior when parked.

Looking at self-sufficiency, the Grand Design Momentum G-Class 28G packs 56 gal of fresh water and 150W of solar. The Keystone Carbon 338 counters with 59 gal fresh water and 300W solar.

Price is often the deciding factor. The Grand Design Momentum G-Class 28G starts at $70,000 MSRP, while the Keystone Carbon 338 commands $74,000 — a $4,000 gap.

Families with kids will appreciate the extra sleeping capacity and living space. Off-grid campers should pay close attention to solar wattage, battery capacity, and tank sizes. Full-timers should prioritize tank capacity, storage, and overall living comfort.

No comparison can replace walking through each unit yourself. Visit a dealer and experience the layouts firsthand.