Oilmen's third generation of its DEF insulated tanker used for hauling Diesel Exhaust Fluid includes insulated tank, insulated and heated cabinet, insulated and heated piping, and protected pumping equipment. The 4000 gallon DEF truck tank has the ability to self-load from a large DEF bulk tank that is commonly used at a distributor's facility, bulk plant or railcar. Piping that allows the operator to bypass the hose reel is also standard equipment that enables rapid metered deliveries. Additional improvements include better accessibility to components and vibration reduction materials that will prolong equipment life.