This rig looks awesome. And as my van is a quadvan too (e350 2008) I am sure the ride is good.
My concern would be the added height.
As you can see in my trip report (France)
http://www.sportsmobileforum.com/for...aby-17580.html
I live in germany and we use our SMB in europe and its surroundings. Here it is quite usual that you have to cross woods. I was quite happy about my rather low pop-top in many places.
But I guess in the US, especially in the southwest, you will have much more open space than we do.
Philipp