When we had ours I had it mounted right behind the fuel tank. Unfortunately I don't remember the name of the company where I got the hoist. It took 2 pieces of 2x2 angle iron between the frame flanges to hang it. I had to drill a hole in the frame and the storage compartment wall for the crank to access the winch.
Memory's not as bad as I thought.
http://www.tuf-tug.com/st.htm