photos of my rear porch....off of the bus and turned up-side-down. I believe that it is a total of 7 feet long. 5 feet of porch, and 2 feet of steel to bolt to the frame. I think it's really about 2 feet longer than it should be. The original plan was to put 4 feet of steel under the bus, but there was a bracket in the way.
on the idea of hinges, you could certianly make it strong enough, and easily removable using a pair of pintle hitches. I think Phill talked about tha before.
The rusty parts are what get bolted to the frame of the bus