Wow, this thread really turned into a doggy soap:-laf Putting the macho tendencies back in the shoe box and getting back to the original thread, is the concern theft through siphoning out of the truck's tank? My OEM filler hose has a check valve at the bottom that doesn't let that happen, I would suspect this is true for many if not all of our trucks. I used to ride around with a locking fuel cap until I realized that I was just locking myself out. 
