Solar-powered, self-contained restroom trailers from NuConcepts are designed for the special-event market where space, capacity, electrical or water connections may be limited. Units have a 40-gallon freshwater tank, 65-gallon waste tank, incandescent lighting, enclosed stainless steel sink and flushing china toilet. Each restroom offers an average of 125 uses between servicing. Options include air conditioning, powered roof vents, water heaters, interior heat, power converters and winterization. 800/334-1065; www.nuconcepts.com.