I am thinking a ram air & small exit air vent would not work so well, you could fill it that way though then seal it off.
Stopping at the stop light it would deflate and go limp, then flap and blow around until you get up to speed.
I think it would work real well on a Dekotora
though.
I like the inflatable boat tail, having the floor fold down and act as a base for it is a great idea.
The nose of it, above the roof has got to go.
A redesign must be executed!!
Spare no cost !