First thing to do is to weigh the coach, verify that the right tires and pressures are being used; you should not still be on the originals. You should think about replacing the shocks and then proceed if need be from there.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7