Doesn't anyone do a thorough test drive before buying? :S So many folks complain about the handling of their coaches but if it was poor on the test drive why in the world would they have bought it in the first place? :h
If it was fine on the test drive and down the road the handling deteriorates then it is a simple matter to fix/repair or replace the defective component(s). Too many people expect a 10 to 20,000# motorhome to handle like the family car and that simply is not going to happen. Also, as noted above, overweight motorhomes seldom handle well and many roll out of the factory at or even over their designated weights. A trip to the scales and the proper psi can work wonders for $10 or less.
:R