Heather, give us the specs on the truck. Year, Model, Mileage, Engine and Trans. My first vote is going to be against the extended warranty; but could change.
Did you have anyone look for paint lines? Open all the door jams and feel with your finger and nail, along the edges of the door jams for a paint line. Check the hood and fender areas too, as well as the gas cap. When under the hood, make sure all the fender bolts (along the top of the inside of the fender) are in original places, no messd up paint, or elongated holes. Also, with all doors and hood shut, make sure the seams between all body panels are uniform. Take a look underneath, and look for overspray on the undercarriage, and check the frame holes, used for attaching chains for towing and etc. If any of them look mangled, or stretched, this is indicitive that the vehicle was put onto a frame straightener. None of the doors should droop or bind when openning and closing. Good luck.