We bought a used 2000 Georgieboy Class C a year ago.
The previous owner (or factory) had changed the "D" rated tires to "E"
Depending on which literature for my MH; from the factory,
you see either D or upgraded later to E rated tires.
Mine are BFG.
So I e-mailed BFG about tire pressures.
They said without a 4 corner weight they would only recommend
that I run the max stated 80 psi. With a 4 corner weight they
would give specific recommendations.
The truck center that did a brake job set the rears at 77psi
and front at 72. Mine is a short 24ft and no I do not believe
anywhere near max weight. We load light. I still have to weigh it.
Several tire web sites have tire psi for weight listed.
Michelin is one that has it on their web site.