Filled your data in my motorhome-tirepressure-calculator wich uses 10% reserve and calculates with an even saver formula then the tire-makers use.
then rear gives even 87 psi as advice , and thats allowed by the tire makers to go 10 psi over your AT-pressure of 80. front 77psi so 80 would not even be that bad.
These pressures give the maximum reserve for things like ,pressure loss in time, unequall loading right left, misreadings of pressure schales etc.
But still comfort and gripp is acceptable.
Here a picture I made of it.
And yes this means that your tires are yust enaugh so an upgrade to F-load for instance or a bigger sise would be wise.
But you dont have to be alarmed , no danger to the tires with these loads .
But see if you can find the GAWR's and GVWR to see if your motorhome is overloaded, thats also not allowed by law.