<human>:  What is the difference between an RV and a trailer?
<bot>: The main difference between an RV and a trailer is size. RVs are self-contained recreational vehicles that have their own kitchen, bathroom, and sleeping area, while trailers are usually towed behind a vehicle and do not have the same living accommodations as an RV. Additionally, RVs typically have more amenities than trailers, such as air conditioning, running water, and more powerful engines.