Just wondering how many of you would buy a used truck off a different manufacturers lot. I've always heard the theory that if the person who traded it in is switching brands then theres a higher chance of the vehicle being a lemon. The truck I'm looking at is a 2005 Sierra 2500HD ext. cab, 4x4 with the duramax, 95,000 miles, and SLE trim level for $21,000. Good deal, or should I pass?