Semi Tractors Semi Tractors from Jack Waller Semi Tractors Semi Tractors - Cab-over design vs. traditional Tractor design. More Aero Semi Tractor - I once saw a late 30's/early 40's Tow Truck that may have influenced this. Reduction in frontal area yields better aerodynamics in the end. Semi-Tractors gLike Semi Tractors Industrial Design Share R 7 n Jack Waller Transportation/Product/Game Designer Arvada, CO Follow Contact