In your OP you left out the key fact that this was with your tailgate down.
The regulations are for how the vehicle is intended to be driven; not with doors open, tailgates down, things blocking your view, etc.
It boggles my mind the number of people that assume just because they don't use the frunk it means that no one uses the frunk.
I am another person that uses the frunk daily.
But I also am not butt hurt about the lack of a powered hood in the R2. The price cuts had to come somewhere.
U-hauls auto transport trailers aren't great. They have no provisions for a weight distributing hitch (the chains) and the surge brakes would interfere with that, essentially the hitch and the brakes would work against each other in a way.
Another thing to keep in mind is the tongue weight...
Switch your plan for use case.
21" should be the off-road rim and 22" should be the high-way rim. You'll want the taller side wall for anytime you have to air down.