It is whippersnapper. Your mind seem to be typing faster than your fingers. We will be glad to help but if your spelling and texting can't improve, as well as your description as to what you are trying to do and what you are already considering then expect some push back. As for the tank, this subject has been cussed and discussed several time especially for task force series truck. Try to research what has already been done.
You can make just about anything work as long as the general dimensions are good for the area you are mounting. If you are looking for a bolt in tank then go to the magazines and call a vendor. If you want to use something else then tell us the details as to what dimensions you have available, how many gallons you are wanting to feed and how you expect to access the tank..Side fill or bed fill.
We are happy to help but we cannot read minds. BTW Welcome to the bolt. If you have not already done so, introduce yourself here and tell us just what you are trying to do to your GMC.
