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If you use the search tool abve your post you will find this has been addressed and alot of good ideas on how to do it. Myself I will leave mine inside where it has been for 43 years without a problem. My truck has been turned over on its top once and T-boned once hard enough to send the side pocket out the other side, but the tank has never been a problem. Can't say what would of happened if I had saddle tanks or a rear tank when the bed was hit that hard. Just my $.02 worth.
Another member posting topic within past few days seem to recall feedback and number of suggestions. Believe a member moved the tank and posted pic's. Another member post pic's where he routed fuel inlet thru the top of the bed rail on styleside pickup. Thought it look cool; although, only one suggestion would be to recess inlet below bed rail level and install a door. Came across this article in Truck magazine where they used a Mustang tank and relocated the inlet. Imagine any tank would work, if get serious suggest take measurements and search for size tank that meet the application. Saw quite a few fuel tanks in couple Ford truck parts catalogs, National Parts Depot (NPD), has quite a selections. Anyhow, suggest the search and here is the web site of the article may provide some suggestions.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.