Poor ride on the E450 platform

Thanks for all of the comments, I've come to the conclusion that my tires are over inflated. I carry very little stuff, 250 lbs max, plus my wife and I, not towing and have front - 65 and rear - 80. The coach only has 20k miles on it so I think the springs should be ok, probably could use some new shocks.
What should the tire pressures be with this load?
The coach is 26 ft.
Thanks again!