i'm sure this has been addressed before, but i did a search and did not really find anything so bear with me. i've owned 2 other yukons (03 denali & 06 xl denali) both of which were bought new and traded/sold before 60k miles. loved both and never had a problem with either. unfortunately, i am no longer in an economic position where i can afford to buy new and am considering a 2008 sle with about 53k miles. it looks clean, has a 2 owner clean carfax and drives well. is there anything in particular i need to watch out for or should have checked out before i buy? TIA