Welcome to irv2, Chaser, looks like a great idea.
When the teens traveled with us we pulled a 8' sq box sleeper behind us, by Dutchman, it came in handy when we went across Can. an U.S. in 2000. It has more milege than the three MH's it has followed.
It could sleep 5 or 6 thats all and didn't have to be disconnected from MH. We still have it my daughter and her family now use it. We were lucky to find it before trip because no one seems to make just a sleeper these days. Good Luck on your venture "Dream Chasers".