Definition: The largest, bus-shaped RV. Built on a heavy-duty chassis (often a commercial truck or bus chassis).

Typical Size: 26–45 feet long.

Features: Full-sized kitchens, bathrooms, master bedrooms, slide-outs, washer/dryers, and even fireplaces.

Ideal For: Full-time RVers or families wanting max comfort and amenities.

Pros: Spacious, luxurious, all-in-one living and driving.

Cons: Lower MPG, harder to maneuver in tight areas, expensive.