While I don't want to endorse everyone to pull a load over the suggested weight ratings, keep in mind that what comes from GM is a suggested weight rating based what they feel is a relatively worse case scenario. It is not in terms of max weight ratings.
There are many factors that go into their ratings, some of which has nothing to do with the vehicles ability to safely tow the trailer. They obviously have to stay way on the safe side to limit their liability.
Also, it is my opinion, that if you have the air suspension, you can safely tow up to the rating given for use with a weight-distrubition hitch. GM is providing the rating based on a coil suspended rear end, not with the air.
To opine on your question, JMV1210, your trailer probably weighs about 2500lbs empty. Meaning, on your trailer you should be safe by adding about 4500lbs of cargo. The trailer you have should be well-matched for your H2. I have a trailer similar and it is a smooth and easy pull with the H2.
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