I have Michelin tires on my Class C. I run mine at 78 to 80 lb. cold. I run the fronts at 75 lb. cold. I do not use a tire monitoring system.
What matters is what the tire pressure reads after the tires have cooled back down. Do all the tires read the same (within 2 lbs. for duals)? Do not lower the cold pressure on the inside duals. That could cause them to overheat.
The problem I ran into after replacing my original 10 year old Michelin tires is that all the standard rubber valve stems leaked within 3 years. The valve stems must have been from a bad batch. I now use steel valve-stems with extensions so I can test tire pressure as often as I need with a good quality pressure gauge.
I check tire pressure every morning before driving on a multiday trip. "Cold" means ambient temperature for that day (per my RV manual. If the next day is hotter you might need to release air to get back to 80 lb. maximum before driving that day.