A number on months back Trailer Boats Magazine conducted a towing test with an H 2. They did not give it the highest marks. Not suprised. Primarily a weight issue.
That 325 HP fades fast when the unladden weight is about 7,000 pounds. Not enough get up, plus tall tires, etc.
I cannot understand why GM does not put the diesel in the H 2. And does not have plans to.