The PTM980 portable restroom service unit from Imperial Industries has a steel two-compartment tank with 680-gallon waste and 300-gallon freshwater capacity. It is available in two models: a standard truck-mounted unit with a Masport HXL4V vacuum pump or a modular unit with a Masport HXL3V vacuum pump and 9 hp Honda gas engine. The modular unit is self-contained and can be mounted on a standard chassis frame or a flatbed. The modular unit comes complete with the electrical package and is prewired and plugs into a standard chassis trailer outlet adapter. 800/558-2945; www.imperialind.com.