mindlissmetalfab
+1y
Any particular reason why you'd like it in the bed?
I like to fit stuff under the box as much as possible. It makes things alot easier if you can have a fully functional truck with no box, and plumbing is easier too.
On a 91, you should have room for 2 slim tanks outside the rails in the rear if you wanted.
Just a suggestion, if you are set on having it in the box then go for it.