Welcome to the Truck Conversion forums, Bill. That sounds like a great idea you have to see the country while educating your child. A friend of mine did something similar with their 3 children. They created a pretty good web site to document it:
Kirkwood Family Field Trip USA
I like the idea of a Truck Conversion with a bunk above the cab for your family. Or, a conversion built on a sleeper cab with a bed between the two front seats and the living area? I really like this coach that is for sale that Hawk built:
4509GCDDGTA0Csb Those two sofas in the cab area make into a pretty nice bedroom. I looked pretty seriously at that coach before buying mine but with the garage it doesn't have a 40k lb. hitch. I want to maybe pull a stacker trailer so I needed the heavy hitch. Hawk said that coach would have no problem with a 10k lb. trailer tho.
For boondocking t/c's are a good choice. Most seem to be made for the race car people that "camp" at the track and often tracks don't have hookups and such in the paddock areas. My truck has 200 gallons of fresh water.