Sometimes referred to as pickup campers or slide-on campers, they are the most versatile of RVs -- mounted on a pickup truck, they can go almost anywhere. Popular with hunters, fishermen, and other sportsmen, their amenities include refrigerators, stoves, ovens, microwaves, bathrooms, and showers. When not in use, truck campers can be parked in a standard driveway or backyard (if the neighbors don't object).
Price: $6,000 to $55,000
Leading manufacturer: Numerous (more than 30)
Notable brand: Northwood Manufacturing Arctic Fox 990
These cars and trucks double as cabs, cargo vans, and everything in between.