Welcome to the FMCA Forum.
It is very rare for a motorhome to have perfect left/right weight distribution. And, with a leaf spring suspension (assume what you have-- if not, let us know what chassis you have) it is pretty common for a coach to be lower on the heavy side.
First thing is to move you heavy items to the "high side". Then, any good truck spring shop can install a spacer or additional leaf (if quite a lot of weight difference) on the low side.
If you have all wheel position weights, would appreciate knowing them. I know RVSEF will be at the Perry FMCA Convention doing all wheel position weighing.
Dianne and Brett Wolfe
1997 Safari Sahara 3540
Moderator, FMCA.com Forums
Chairman, FMCA Technical Advisory Committee
Member, FMCA Long-Range and Development Committee 2007-2009
Moderator, http://www.dieselrvclub.org/(FMCA chapter)