I know you have a specific market in mind for your product, but have you ever considered something like this Expo member built?
http://www.expeditionportal.com/forum/threads/137366-Tacoma-aluminum-Pop-up/page7
I like your product but prefer something that stays in one parking space for situations that I want to open it up when I am not out in the wide open spaces. I also would prefer a hard top so I can use solar charging panels that are mounted as well as minimizing the amount of tent fabric.
This may not be where you are headed at all but I thought I would ask as this member's idea is very interesting and a nice custom build.