If there is someplace you want to go to that is physically too daunting for a motorhome to go, chances are it is not a good idea to attempt to take a huge and heavy fiver there as well.
And the same goes for campgrounds and state parks that have size limits. If 35 feet is the limit, then 35 feet is the maximum length no matter what your RV is.
It sounds like you want to be on the move pretty much constantly. Even though I own a fiver, I would switch to a motorhome if I were going to do that kind of travel.
Because by nature I tend to be risk adverse, I would be looking for the most reliable motorhome setup for my needs, but not necessarily the manufacturer's name or how luxurious the rig is.
So you might want to tap the motorhome experts on this forum for what kind rig would likely cause you the least problems over the time period during which you intend to use it.
For example, if every year for the next five years you intend to use your RV for 3 months per year, and store it for 9 months, during which time you will not be in the US to service it, there might be something available that is only one year-old, and like new, (but it might not necessarily be the absolute ultimate in luxury), that would meet your requirements.
In other words, you do not want to buy a much older but really fancy monster motorhome and find that when you return to the US each year that your travels will be delayed for 6 weeks to make repairs.
It's just a thought. You might as well investigate all of your options before you buy.
Sometimes bigger is better, yet other times newer is better. Us belt and suspenders type people tend to lean towards newer. It's kind of like investing in the stock market. A awful lot depends on your tolerance for risk.
