I've driven 4 hours at the most in my H3 and didn't have any problems with the seats. I have the cloth as well. I would agree that they are very "flat" seats so for some people it could cause an issue with the lower back. I know you tried the lumbar but did you try "inflating" it all the way?
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2008 Hummer H3 Alpha Adventure. Graphite Gray Metallic.
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