As an actual Tire Design Engineer (Ret) and RV owner I monitor this and other RV forums and try and answer questions based on my 50+ years experience. It would make my job easier if you could provide the following information so I don't have to start out asking questions which may seem like I am making things difficult. Without the facts I would be forced to guess and as an Engineer I do not want to Guess.
1. What does your Certification Label say for GAWR, Tire size and Load Rating.
2. Are your tires P type, LT Type, ST type or Metric (no letter before the numbers)
3. Truck scale readings when the RV is loaded to it's heaviest. Individual axle readings are better than the total if you have two axles. The weight should be when you are hooked up as if you were traveling.
4. What is your normal cold tire PSI?
5. Do you run a TPMS?
6. What is your Low Pressure warning level set on your TPMS.
7. Why are you changing tires?
8. What are the new tires you are using (Size, type and LR)
9. What is your question?