Please help i have been searching and have not found any information.I have a huge amp 5ch and I want to mount the amp under my 3rd row seat.But can i safely mount it there without hitting the gas tank?

 

yes you can. when you install it, use short Stinger screws and just screw it into the carpet and padding. It will be more than enough to hold the amp in place. If you really want to fasten it down to sheet metal, just get under your truck and look.