Parts Inventory > Auxilary Power Units > Willis APU 


Our products include the original Premium, compact Willie, and our economic GenForce APU. The Premium unit is customizable to include additional power supplies such as an hydraulic pump, pneumatic compressor, additional alternator, generator, welding alternator, and more. The Willie unit a compact version of the premium unit with custom installation options. The Willie offers maximum heating and cooling features with additional savings.  Both units are available in CARB Approved propane or with the standard diesel engine. The economical GenForce offers maximum heating and standard cooling options, shorepower, and quick installations.