I would go back and re-check things. First, why are you towing a 4,000lb trailer (that's giving you plenty of room to add accessories, fuel, etc.)
Second, the H2 can drag 7,000lbs all day long. Who knows where you are, so hills will be an issue, even with 1500lbs behind you, but the H2 with a properly set up brake contoller and e-brakes tows just fine.
IT IS NOT A MAIN TOW VEHICLE though. If you are going to tow often, then figure something else out. If it's once a month then you are set.
I am running 37" MT/Rs with no S/C and quite often tow 10K lbs and I tow a 20 ft enclosed with various weight as well. Hills/mountains are the only issue. I have the Warn winch bumper and Warn light bar with 4 lights on it and my tranny temp never gets too high.
Of course, I consider having rear air a must on the H2 for towing any serious weight also.
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