Roger in VERMONT wrote:
We use 100 in front and 110 on rears. Have done this for 18 years this works best for us. We have a lot of weight 35,000 lbs to hold up.
And those pressures may be perfect for your coach, but 10-30 PSI off for the OP.
There IS NO ONE ANSWER FITS ALL. That is why the tire manufacturers go to the trouble and expense to develop and publish Inflation Tables (PSI for a given weight).
This is definitely one of those places where what is correct for one has no/little relationship to what is correct for another.