Campervans usually have a small kitchen with a refrigeratorand a two-burner gas hob and grill. They generally have dual-voltage lighting which can work from either a dedicated battery known as a deep-cycle or leisure battery, or from AC power, supplied at a campsite via a hook-up cable. Larger models may include a water heater, space heating and air conditioning, a portable toilet and even an internal shower. Smaller models often carry a "porta-potty" portable toilet, and sometimes an external shower which operates within the privacy of an awning.
Pop-up roof variants share certain design elements with roof tents as sometimes fitted to more robust four wheel drive off-road vehicles
intended for expeditions rather than relaxed camping. A compromise
between these two worlds is sometimes reached by basing the conversion
on an off-road vehicle. Sometimes the conversion is demountable from the
back of a pick-up truck body.