Hello,
I have a bike rack in the front AND one in the back,

That is because I need to transport 4 bikes and I think that for longer
distances two on each rack is better.

I drive the bus (73), with the racks on all the time.  I never bother to
take them off.

My gutless wonder is not affected with the racks, and/or with the bikes on
the racks.  I could not tell any difference in performance, nor to my
surprise in wind noise.

Just this person experience.

Regards, Andrea

PS, thanks to all that pointed me in the direction of the hitch.