Primary reason for going narrow - bad experiences with parking in tight spaces. Tearing out porch overhangs, roses, exhaust systems, very narrow road going to friend's cabin. If you have the real estate appropriate for keeping a 99" vehicle, and only go to established campsites, you won't have problems with a 99" wide coach.  It's bad enough trying to fit one through a tight space when you have someone outside to guide you.  But this time around, I want to be able to travel alone.  I'd rather stay in hotels than deal with that stress again.
Yes - I know this will fire some people up.
Maureen