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.
Brett and Dianne Wolfe
2003 Alpine 38'
Moderator, FMCA Forums
Chairman, FMCA Technical Advisory Committee 2011- Present
Member, FMCA Long-Range and Development Committee 2007-2009 and 2014-2015
Moderator, http://www.dieselrvclub.org/(FMCA chapter)