. New tank is 30"wide (X17"long) and frame rails are 34" to the outside so if I trim a little off the bottom flat I should still have 2" of frame rail left on the bottom on each side of the truck. Top rail will be left alone.
Planning on adding a 4" steel channel across the back of the steel frame for strength. Adding 1/4"plating on the outside of the frame for protection of the tank and strength things and then a receiver hitch to help hide the tank.
Tank is only 7"deep so maybe 3"-3.5" might stick below the 4" frame rails. should fit good.
OUCH -I just priced -AN fittings for the top of the cell -- expensive stuff!!! no wonder they are military stuff . The regular people cannot afford them