I'm doing some pretty major work on my 53 over the winter and need some advise. I'd like to move my gas tank to the back of the truck and out of the cab. I know a lot of people do this. Looking under my truck in the back, I can't really see that I have room for a gas tank. The rear crossmember is pretty big and looks like it would be in the way of a gas tank. I need some help on this one. Thanks.