The 530 GL slide-in unit from CUSITEC Custom Tanks and Trailers has a two-compartment tank with 353-gallon wastewater and 177-gallon freshwater capacities. It comes with a 35 cfm vacuum pump, a 5.5 hp engine, vacuum and pressure-relief valves, and a Shurflo 1.8 gpm washdown pump for maintaining the cleanliness of restrooms. The unit is easy to install and remove for convenient service in the event a truck breaks down. It can be installed in a pickup truck. 915/239-8919; www.sanitariosyquimicos.com.