Size

I have owned 3 rv's the last being a high end almost 44'. I felt that it was great for major highway driving and when we were in our campground. But it seemed most times when I got off the major highways on a "spur of the moment" type event I'd get in trouble. (I also towed a jeep so couldn't really back up).
As a result we'd miss a lot of stuff that we'd see driving and would of gotten off to visit and see if I wasn't worried about potential problems, like branches scraping the sides, not being able to turn around etc. These rigs are also taller mine was 13' tall and in my opinion/experience you really need to know about where you're going and stick to the plan. I sold mine and currently am looking at much smaller rigs. Also if you run into any problems that require towing or repairs it becomes a whole different nightmare. With the big rigs usually come with lots of conveniences and they also of a tendency to have problems resulting in you having to fix them or trying to get into a shop for rv repairs, which is a whole other thread. Just my 2 cents and experience