need a little help/advice

[softail250]

Hey guys, long time reader here. I'm going to an auction tomorrow and thinking of bidding on a truck. It's a 2007 GMC 2500 with the 6.0 gasser in it. Truck has 88,000 miles and looks clean on the pictures I've seen. The truck also comes with an 8' Meyer plow. First question, in the couple of hours of "pre-inspection" before the auction begins, is there anything specific to look for as far as problems with this particular model ? I'm attaching a couple of pictures I got from the auctioneer's website, can any of you guys tell if this truck has A/C from the picture of the dash, I'm not familiar with these years GMC,( I have a 2010 1500 Silverado ) next question, this is going to sound stupid, but is this truck a 2500 HD, or 2500 LD? Like I said, a stupid question for those of you who know these trucks inside and out. Thanks a lot for your time. (p.s. if the truck don't have a/c I'm probably not going to waste my time even going to the auction, that's why I asked the question).

[00Silverado4x4]

The button to the left of the temp sliders looks like a snow flake so I'm pretty sure it has AC. Really hard to tell. Also all 2500s of this year were HDs according to: https://archives.media.gm.com/us/gmc/en/product_services/r_cars/r_c_sierra/07sierraPK/07_GMC_SierraHD2500_specs.html