Shopping for a HD truck to pull 7500# fifth wheel camper. Local dealer has a 2002 Chevrolet 2500HD, regular cab, 4x4, 8.1 Litre, automatic, long bed pick up with 3500 (that's correct) miles. Positive of miles and title is good. Mechanically, what should i be aware of considering the age/miles of this truck. It was used at a rental car company distribution yard for the security guard. I test drove this truck and found no issues. Asking price is right with NADA consumer pricing guide.