Stefan, if you really don't "need" this grill, what I would do is put a high price on it and see what happens. I did that last fall on my Skyline. I listed it for $400 and it was about this time of year or later. I figured I would just let it sit all winter and drop the price in the spring to move it or maybe even keep it. I was shocked when a guy drove nearly 200 miles to pick it up and I truly don't think he cared a rats arse about the skyline logo.
Maybe list your Summit for $750 and see what happens. That isn't your typical Genesis three burner you got there. If nothing happens, you haven't lost anything.