You need to stay away from the shop that told you to run 110 psi, they're morons! DocP is correct, get accurate weights and set your pressures accordingly.
You can spend LOTS of money on suspension goodies but you have to understand you are driving on a truck chassis with a house on it. The MH is never going to have a car like ride, it's always going to rattle.
A set of Bilstein or Koni shocks will help SOME, they are an improvement over stock. Even a DP with air suspension rides rough on bad roads, just not much you can do about that. I-40 is rough every where, not just Arizona!!!
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