The flat vacuum tank from Crescent Tank Mfg. has a low-profile design with low center of gravity, making it safe on off-road and unstable terrain. It can be custom sized from 100 to 2,000 gallons and allows operators to carry equipment needed for the job on the bed. Liquid is held inside the truck bed and can be configured with multiple compartments. The vacuum tank is constructed from 1/4-inch mild steel. 585/657-4104; www.crescenttank.com.