The PTM980 portable restroom service truck from Imperial Industries has strong steel construction and stainless barrel protection, a 680-gallon wastewater compartment and 300-gallon freshwater compartment, plus a modular option that allows for the vacuum pump and engine to be easily self-mounted. Available on Ford F-Series and Dodge Ram trucks, it comes in two- and four-wheel-drive models. Additional units are available in 1,175-, 1,300- and 2,150-gallon sizes. 800/558-2945; www.imperialind.com.