Im also considering a purchase for this reason. Two reasons I havent already made a purchase is because I havent seen any tops "popped." I would like to know that is possible before I make a purchase, that head room will make a world of difference. Second, I am very interested in the CNG/LGP bi-fuel option. It would be great to use the CNG around town and as a back up when traveling long distances. Hopefully you get some responses.
P