Bypass all this by having an inflatable front and back that auto-inflate to make a pointed front and back when going over 40 mph on a straight road
In the U.S., many tractor trailers have something similar, but they fold out on the back and underneath the trailer to make the rig more aerodynamic.
Example: https://www.fleetequipmentmag.com/wp-content/uploads/2015/03...
I've never seen any fold-out attachments for the front, so there's probably not much to be done there, except for the roof of the cab, which often has a built-in fin/wing/whatever to help air get over the trailer.