FWIW, When you go the class A route you are also setting yourself up with another drive train that requires work and money. Then if you do travel (like you said) you will want a tow car. You may have one already, if not that's another expense.
5'th wheels are nice if you already have a larger truck. Towables are the cheapest way to go, but they may not be the best form for carefree cross country driving.
Just spent two weeks in Carthage/Joplin, MO that has to be a mecca for RV sales. You could always take a drive there and tour your options. Maybe something will pop out at you.