OK, here's a picture of my H3 with H2 tires.
Another link in case that image reference doesn't work:
http://www.pbase.com/hummer2006a/ima...42674/original
No, unfortunately it does not use H2 wheels.
That would be awesome.
Hummer engineers, please make the H4
use the same wheels as the H3 very easily...
(Sure hope some H4 engineers read this forum.)