When going full-time, the first concern should really be comfort, and for that we found we needed a big rig (36' fiver). This is your home, afterall, and you can't "go home" to somewhere else once you go full-time.
There are gazillions of scenic places to see by RV but you don't have to camp in all of them... you can stay in a comfy RV park and drive to the scenery every day.
The best method we've found for parking with multi-million dollar views out our windows is Boondocking.
We boondock all the time, and that is the most scenic way to camp imagineable. The US public lands in the west are extensive and we regularly camp in a huge open area with as much room to spread out as we need (and then some) and with views we could never afford to buy.
We stopped staying in campgrounds and RV parks because it was just plain too complicated -- hard to fit in, too many rules and regulations, and very very expensive
If this kind of camping appeals to you, we have lots of boondocking info on our site:
RV boondocking tips & tricks
