norv, good for you, doing your research first. You are getting some good advice here so far.
I retired in 2005, bought a 5th wheel rv (30 foot tip to tip), a 3/4 T Duramax/Allison long bed crew cab, and started traveling to see the USA that we had been too busy raising a family to see before.
We never "full-timed" because we still have family on the east coast that we love to spend time with, so most of our travels have been a month or two in duration. We get home/family sick if we are away any longer.
So far we have camped in every state except Alaska, and Rhode Island, for at least one night.
I am saying this, not to brag, but to show you that you can do it with a 5th wheel camper that is 30 foot tip to tip, and a 3/4 T truck. If we full-timed, or wanted more luxuries we would need a bigger camper, and a heavier duty truck.
That said, there were only a couple campsites in the hundred or so we stayed at that were uncomfortably small, or hard to get into. But it happens.
In the same vein, we traveled thousands of miles with friends with campers up to 40 feet, and usually had campsites right next to them.
So in my opinion, any camper that suits your needs, between 30/40 feet, and a vehicle that can handle it, will work for you.
You won't really know what your needs are until you have camped/traveled a bit. So go ahead and get the rv that you think you want, and maybe you will get lucky, but don't be surprised if it is not....Jim
2006 Wildcat 27RL
2006 2500HD w/Allison/Duramax
KB3TXH