[dsraven]

ok, that idea may not work. I found a pic of what that rear wall looks like with the outer skin off. it is an inner panel that you can see from inside the cab behind the tank. then a sandwiched support panel that is hidden between the inner and outer panels. then the outer skin. maybe you can blow that pic up enough to see what it looks like. you could try looking online for a pic of the replacement panel set and see what the parts look like. maybe then visualize how it goes together from looking at this pic? not much room there for the flat bar idea I had in the last post.
good luck