"Question: did someone under inflate the rear on purpose to leave room for expansion?"
Tire pressures are always measured when cold, and expansion due to heat build-up has already been taken into account...
They probably went to 75 psi on all four tires for the purpose of saving some time...
Good Sam Member 843599689
FMCA Member F473304
Current coach: Tiffin Wayfarer 24 BW
"History shows again and again; how Nature points
out the folly of man..."