According to the state of Washington, an RV is a travel trailer, camper or other vehicle designed for use on public highways and streets.
A travel trailer has a single chassis and is towable on highways and public streets. It’s designed to provide temporary residence and has no permanent foundation. It does not require a connection to utilities.
A camper provides recreational and temporary lodging. It is larger than 5 feet long and 5 feet high and is designed to be towed by a motor vehicle.
A park trailer is a travel trailer that can be connected temporarily to utilities such as water and electricity. The trailer’s area cannot be larger than 400 square feet when set up.
An RV may also be a boat, snowmobile, ATV or motorcycle.