How many RVs and fifth wheels have you seen that are taller in the back versus ones that are taller in the front? I am sure they are more convenient when they are taller in the back, but I am sure that most people think the tall backs are more aerodynamic than ones with low backs--just like cargo boxes.
Why do people turn cars into pickups? How much time and money does that take?
https://www.hotcars.com/20-sedans-th...pickup-trucks/