Congrats on the new coach. Now it is time for you to learn the basics. One of the most important is knowing how to load your coach.
You and your wife both need to load EVERYTHING in the coach that you think you will need for your travels. This includes food, seasonal clothing, full fuel, some water in the fresh water holding tank, as well as any tools, or other items that you think you may need on a trip.
Once the coach is loaded, then you need to take it somewhere to get all four corners weighed with all occupants in their seats. Most coaches handle better if the front axle is loaded close to maximum. You also want to make sure that the side to side weight is pretty close. This is where you can start to shift items around to achieve the right weight and balance.
This exercise will let you know IF you can take everything with you, or if you now need to start leaving some things behind because you have exceeded the maximum weight of the new coach.
Only after you have done this can you go to the tire chart and get the exact tire pressure you should be using for the load you are carrying. Most owners will add another 5PSI for safety.
Welcome to the RV world and now you need to do everything to have a safe journey.