U-Haul rental trucks have a low profile, rounded corners and advanced chassis skirts to reduce wind drag and raise fuel economy 20%. All U-Haul rental trucks use cheaper, cleaner and more convenient unleaded fuel.Use the fuel-economy gauge to save money on fuel and reduce air pollution.he low decks on U-Haul trucks were designed for families to load right from their house. Our competitors' trucks were designed to be loaded from a loading dock. Our patented EZ-Load Ramps Â® are wider, shorter and more rigid than any other ramps in the industry.