The Tow-Let portable restroom trailer remains sanitary and usable while being towed from job to job for up to a month before service is required. Permanently mounted on a trailer, the unit is a self-contained polyethylene portable restroom with a 50-gallon waste tank and 30-gallon freshwater tank for washdown. A solar-powered 12-volt system powers the washdown pump, which charges the hose on a self-retracting reel. The unit includes a single-user hand-wash sink, LED interior lighting with control panel and a storage box for supplies. Larger size tanks (including a 300-gallon waste tank for long-term placement) are available, and units can be customized to match company colors. It can be towed behind any vehicle with a 2-inch ball receiver. 712/623-4007; www.tow-let.com.