I have a 34' Avion triple axle trailer that hasn't been used in years. Someone stopped by yesterday (happens every few months) to see if I would sell it. The answer is always, NO. I'm keeping it, but I really don't know why.
I have an Avion C-11 camper that I made a trailer for. It is what my family of 3 uses regularly. Even though I have the larger trailer, I can't take it back where I can take the shorter one with better ground clearance. If you are the type that stays on paved roads and always parks in large campsites, stays inside the trailer when camping, and watches TV or other electrical items while camping, then larger is probably better. For me, if I'm going to do that I'll just stay at home.
For us, boondocking is more fun than staying at a campsite close to strangers. Checking out the back country is something that most campers never see. It really is a lifestyle that you decide you want, that should be a determining factor as to what type of RV you will need.
Good luck with your decision. Let us know what you decide.
