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I don't change my pressure when towing as there is very little weight increase on the RV when towing. I tried higher pressures, but the ride suffered and I didn't notice any significant change in handling.
I also have a 99 Aerbus. Mine is a 32 footer without slides so pretty light. I air my ride rites to 70-75 lbs. When I first got it, I had them at 100 lbs and the ride was too harsh. I also had it at 40 lbs and found that a bit soft. Just experiment and you'll find a level you like.