A recreational vehicle (RV) is a motor vehicle or trailer which includes living quarters designed for accommodation. Types of RVs include motorhomes, camper-vans, caravans (also known as travel trailers and camper trailers), fifth-wheel trailers, popup campers and truck campers. Typical amenities of an RV include a kitchen, a bathroom, and one or more sleeping facilities. RVs can range from the utilitarian — containing only sleeping quarters and basic cooking facilities — to the luxurious, with features like air conditioning (AC), water heaters, televisions and satellite receptors, and quartz countertops, for example. RVs can either be trailers (which are towed behind motor vehicles) or self-motorized. Most RVs are single-deck; however, double-deck RVs also exist. To allow a more compact size while in transit, larger RVs often have expandable sides, called slide-outs, or canopies.