a van that is equipped with such things as beds and cooking equipment, so that people can live in it, usually while they are on vacation. RV is an abbreviation for recreational vehicle. [mainly US]regional note: in BRIT, usually use camper. source
Travel Trailer or just Trailer
A trailer pulled with a connection to the towing vehicle using a ball hitch. source
5th wheel
A trailer pulled with a connection to the towing vehicle using a 5th wheel. source