Some put higher pressure in when storing to prefent flat spots on tires.
Read that these eventual flat spots already are gone after 15 minutes driving.
but if you want to you can go a lot higher then AT-pressure , 20% is what the tires can stand easyly.
But when driving you have to lower them again.
Also jacking the tires up is done , but also unhandy when wanting to keep the motorhome in shape by driving it once in a while.
But there are also blocks to put the tires on , with a curve in it, sometimes called bananas, then the underground is curved and so flat spots dont happen that much.
you could also make a curved hole on the place of the wheels in the storing place , if always the same .
Front tires are the most important because mostly pressure advice lower, so more deflection.
Some write , the concrete underground is also bad for tires.
For that a plastic plate or bag under the tires is enaugh.