'The Pro Series line of restroom and shower trailers from Lang Specialty Trailers have a gel-coated exterior/interior wall, ceiling and subfloor designed to be extremely durable and easy to clean. They have slide-out self-leveling stairs with foldout handrails that require no tools to install. The trailers also have an integrated spray bar washout that allows using the excess water in freshwater tanks to wash out the waste tank while the trailer is being pumped. 724-972-6590; www.langrestroomtrailers.com.