I watch lots of van build videos and one I recall the lady using Reflectix, it incelates and gives great privicy. I almost got a Dodge Caravan but went with a ford econoline E150, wish I got the Dodge now just for the gas milage. If you know someone who good at sewing they could sew cloth on one side of the the Reflectix. Another idea is cardboard. Good luck and hope to see you out there somewhere.