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I think as long as you through bolt it on the top your fine. I would put a over sized washer on it to spread the load a little.

There is a guy who keeps one listed on e bay that is nicely made. I do not have one and have never seen one in person. The step looks nice as it is built with a long and short side to fit the back of the 17 and come off straight. It does look a little pricey but I think a few here have bought them and say the quality is great.