[Big Dave]

Excellent work, Sepp.

I think you are very close to the optimal shape. Yeah, a boat-tail or teardrp might have a lower Cd, the vehicle gets too long to be generally practical and a pickup is all about general practicality.

I like the curved shape. From the simulator ,the curved shape and the straight cap seem to have about the same drag characteristics, but the curved shape looks soooooo much more graceful.