It won't be going anywhere. I am going the old beer keg in the bed route. The stock location for the tank can be problematic for dual exhaust (somewhat the same layout as the under bed tanks on the 70s D100s).
1957 Plymouth (Hemi, Dual Quads, A833 4 Speed 9 1/4 w 4.10) Sold 1937 Dodge Pickup (Hemi, 6X2 intake, 46RH, Dana 60 w 4.56) Sold 1968 Plymouth Valiant 2dr sedan (354 HEMI, 46RH w/4.30 gears) under construction