Most larger recreational vehicle travel trailers and fifth wheels have a bathroom included in their design. However, smaller travel trailers and older models may not have a bathroom, and larger trailers often have additional amenities in their bathrooms that may not be included in smaller trailers.
Very small trailers often include only a small, self-contained toilet that collects waste in a removable section that must be emptied manually. Larger trailers usually feature a separate tank for waste and enclose the toilet in its own bathroom area with a sink. Larger trailer bathrooms may also feature showers and even small bathtubs in some models.