Grigg,
I am a little worried about having that tank in the cab in the event of an accident. Although, anymore if I hit something or someone hits me with the way these trucks are built I may not even notice. Plastic new car VS. All steel old truck is no match.
Have you finished the 48 with the diesel conversion? I see the one picture with the diesel in the frame with no body on it. I would love to drop a Duramax into a old truck.