Also went with the dealer install since it involved re-programming. It's a nice set-up, with the ability to remove the shank when you're not towing, and just plug in the lights. I'm with bren on the towing weight--sounds like what you want to do is too heavy for the X3, especially if you include a passenger and any gear. Besides the x-winds, there's the issue of strain on the engine, not enough power left over to get out of someone's way, what happens on a hill, etc.
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