No way the 60in is gonna fit inside the truck unless you drop the seat, don't like that too much. The damn think looks like a rifle
and it is quite in the way in the back due to it's awkward side.
I too am concerned about rust, but I think it'll be OK if you mount it outside on the rack... INSIDE the JackGaurd for protection from the elements.
Just gotta figure out how.
RRD if you come with a solution, please share. I have thinking about this for a while.