My Denali XL has 180K and the rust is starting to pop thru a bit but it runs great!
Mine has 180K too. No rust yet. I have had the brake system replaced so far. But the best thing is I have no payments. I figure if I save enough for fixes I will do much better than getting a brand new Yukon with all the bells and whistles and the mucho payments. What I probably ought to do is buy parts and store them. Man, I sure do like my Yukon.