My wife and I started out with a 27 foot class A gasser with no slides. We bought it dirt cheap just to see if we liked the MH experience. After one season we decided we did like the MH life and this spring we traded it for a 38 foot DP with one slide. Since we have recently retired we will be taking our first extended trip (2-3 months) in a few weeks. So far this rig suits us just fine. The ride in the DP is so much nicer and the extra 11 feet does not bother me at all. Both were 8'6" wide so that is not an issue.
I do believe at some point we may go to a 40-45 footer with more slides.
We plan to do A LOT of traveling in the next few years.
Happy trails to you.
Keld