I have a 5'x8' landscape trailer that I have been thinking of building a removable box for. This would allow me to keep the box loaded up with everything needed for camping, but still have the trailer ready for normal hauling.
My dad's Rialta RV has a pair of benches in the back with that style mechanism. I would think there are probably salvage yards with RVs somewhere around.
I had the chainsaw in a can as a kid and loved it! I cut down a number of 10-12 inch pine trees to build my shooting backstop. Mind you I was 12 at the time. Now days I would much rather hand that to my son for him to have that workout.