I am in the process of doing a build on my 06 Dodge Grand Caravan and am also thinking about getting a Chevy Express to convert. I would like a 3500 with a 6 liter Motor so I could also tow stuff. It seems that there are more of the Express passenger vans out there so my questions are. With all the windows can you make it into a cargo type van. Like can you insulate and panel over the windows from the inside? If you did would you have problems with law enforcement? Anyone have experience with this type of van?