I've got a 2006 H2SUT with 46,000 miles and the original tires and brakes and it runs like a top! I'm seriously thinking of buying a 2009 H2 if they disconitnue Hummer and giving it to the wife for Christmas and we can be a two Hummer family again. They are built like tanks. I've towed with mine, been offroad, through water - you name it and like Timex it takes a licking & just keeps on ticking.
As for dealers, one dealer in Missouri says they'll stay servicing Hummers, and selling Hummer parts and used vehicles, even if Hummer goes under.
http://www.lynchhummer.com/articles/..._10_08.600.jpg
My uncle takes his Olds to the local Chevy dealer in Albany for warranty work - he has the extended GM warranty.