I used to drive a tactical deuce and half semi in the Army. We got into some tight places, but compared to the Dixie contingent, we Yankees simply could not drive. Hence the dominance of NASCAR by Dixie.
You may be on to something.
One of the unique things about the 72 passenger school bus was the “spring” in the body and frame when it was empty. At 55 mph, the back duals would bounce steadily off the blacktop.
A patrolman saw me doing this and strongly recommended keeping it under 50.