Hopefully this isn't a repost, I did some searching and came up with nothing...
http://www.hummer-h1-h2-h3.com/video.htm
Looks like it might just be a compilation of official Hummer promotional videos that you may or may not have already seen before but I wasn't able to find them on hummer.com.
The fullline.mov is great! snow-mus.mov is nice too, I haven't gotten through all of them yet.
Enjoy!
edited to add: They are LynchHummer videos