Not sure if you already purchased or not but,
I saved around $1500 on '08 Chevy diesel with 15xx miles on odometer over a comparably equipped truck on the lot. This truck was the color I wanted and had a power seat which the other did not.
If you purchase the truck and it has not never been titled make sure they start the warranty at 4800 miles. Did not check this on my '08 and it didn't happen, did have this done with a '95 Grand Cherokee we purchased with 10,000 miles previously.
I also checked the trailer hitch receiver and the inside paint was not scratched or worn off. Therefore it hadn't been towed with.
Also make sure stuff like the owners manual, jack and winter cover if it is a diesel are still there. Winter cover was missing on my '08 and never did get it from the dealer.
Check the bed for scratches also. Who knows what they hauled in there.