Good luck getting a loan with that mileage dude, almost every bank has officially stopped giving any sort of loans for any Hummers, specially with that high of milelage.
here is what I would do, download "Cragslist Reader" (Google it) and search for 03-04 Hummers of any color you want, you will find some for 16-17K for that kind of mileage, let us know what you find, if you do go with the one at Ford.. I would bring that price down 2K at least, they're not going to sell it any time soon for sure, not that many people looking to buy Hummers right now, they dont know any better.
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2003 Black H2:
Blacked out,7" lift,40" Pitbull Rockers, 20x12 Fuel Octanes and lots of more junk, DemonGuard Brushguard
2006 Blue H2:
20x12 black Rockstars & 35"s. missed.
2005 Black Mustang Roush Stage 1 #05-1058:
Showcar, Procharged 580HP, 20" Gianelle's, Prokit, 1/8 in 7.56secs.
2009 Silver Cadillac CTS Premium
White interior, lots of future mods.