David658,
Before you do anything, load up the rig as you would to travel and get it weighed. At least front axle and rear axle weights, and if possible, individual corner weights.
Then go to the tire manuacturer's website and see the recommended pressure for the weight they are carrying. It will probably be different front & back. Add a bit for your own security (5 psi or about 10% seems to be common) and set the tire pressures accordingly.
I won't say "all", but many dealerships just inflate the tires to the maximum pressure printed on the tire sidewall, that is probably over inflated for your rig. It's quite possible you have 110 psi in tires which only need 80-85. Trust me, there is a BIG difference in ride quality when the tires are that much over the required pressure.
And yes, I had the same issue as you when we brought our new rig home over 13 years ago. The dealer/manufacturer put 110 psi in tires which only needed about 85-90.
If you STILL have issues, then you can start chasing the problem with $$$.
Good Luck,
~Rick