I've only had the chance to pull one boat - my brother's 19' (23' trailer) ~4,000 duck hunting boat (alumaweld, and for those in the know, the boat isn't that heavy but when you pull 10 dozen decoys + kayak, gear, etc., it's somewhere around 2 tons). It wasn't too much of a problem, not nearly as good as his '06 1500HD, but got better gas mileage.
One thing (and different than the other posts here), I had no problem backing the boat down with the rear hatch closed. I used to back down the exact same boat w/a '88 suburban and really I think the visibility through the mirrors is better in the Hummer. Not much, but I had no problem backing down using the side mirrors and never bothered w/the rear of the truck.
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