To add to what Carey's saying:
Depending on which aluminum rims you run (I'm assuming they are stock width of 8.5"), you will actually need to run your PSI down to around 20 (cold).
Running them on the PSI that you're on now will cause the center of the tire to wear more. This also increases the chances that you're seeing the wackiness that you are now with performance beyond 65mph. You'll get shake, wander, and you'll get increased wear on your steering components.
The max stock that I've seen with no rub at all are 38.5's (and that's because I'm running 38.5's on mine.) Anything more, and you'll likely see rub somewhere.
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1997.5 HMC4 Hummer H1 w/Slantback shell (Mine)
2006 Hummer H3 Adv. Package (Wife's)
M101A2 Trailer
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