Aerodynamics & Diverting Wind Resistance ?

All the basics have been covered already. But i have a practical suggestion that might help. Put the bed topper on it like others have suggested, and attach these “airtabs” at the rear: Airtab | Aerodynamic Fuel Savers | Welcome/. They’re supposed to help semis reduce drag significantly for fuel economy. They work by creating controlled turbulent vortices off the back of the vehicle that create a virtual aerodynamic shape, similar to what a spoiler does.