Towing with an H2?

[Timster]

This weekend I went to get my boat out of storage to prep it for winter.
I haven't used it in about three months.
I pulled up to find that the tongue was too high on the Hummer.
Luckily the storage had a loaner.
I hadn't towed anything with the Hummer before. I was a little disappointed in it's handling during towing. (No I wasn't going through a slalom course or driving to fast).
It just seamed to be ruff, jerk and the boat felt as if it swayed. The boat and trailer are new and the tires where at recommend pressures. Anybody have any suggestions or experiences with towing 5000lbs plus trailers with a H2. I would like to try and stabilize the hummer during towing. I was thinking that the tongue wasn’t low enough, the boat wasn’t exactly level maybe 1” or 2” too high.
When I towed with my Denali it was pretty smooth and under control. The Denali was lowered 3” from stock.
Any suggestions?

Thanks,