A couple of suggestions, first weigh your coach, then refer to the tire manufacturers load inflation table and then adjust your tire pressure to that recommended on the table to support the axle weights of your coach.
Also there should be a label located somewhere in your coach, usually in the cockpit area drivers side that lists recommended tire pressure for your coach. On our 37'8" coach the recommended tire pressure is 80psi.
We replaced our shocks at 12,000 miles the left front factory shock was completely shot.
For a more comfortable ride I would highly recommend the Koni FSD series shocks.
Best of luck and safe travels