If your coach does not steer/handle/ride well without spending big $$$ on after market "cures"... you bought the wrong coach. A properly loaded, aligned motorhome running on good tires set to the proper inflation should drive, ride and handle just fine.
A thorough test drive is essential BEFORE you buy. If the coach has steering/handling/ride issues {and a decent quality coach should not}, they will not get better over time and miles. Why buy a motorhome that will immediately require throwing large sums of money to solve a problem that should not be there in the first place? :h
As always.... Opinions and YMMV
:C