Sounds like you have a plan. One thing you can do is to rent some and try out a couple different platforms. Motorhomes are easy to rent as are trailers. I know in Canada if you head west to the mountains you can rent a camper truck combo in BC. Iwould think you could find something similar in the US.
Find out what you like and the size buy once. Many make the mistake of buying one thi g and after a few trips wish they had purchased something else.