Hey 92F, since they are used tires, the most important question is how old are they? They all have DOT numbers on them. If you don't know how to read them, take them to a tire shop and see if they will tell you. Age is FAR more important than tread depth. If they are much more than 5 or 6 years old, I wouldn't give very much for them or expect them to last very long. I've had this argument several times in the last 7 or 8 years and have always been proved right. The last time was with a guy who had new tires with "only" 400 miles on them when the car broke down. He wanted me to put them on another car for him. I told him that they were 10 years old. He said "400 miles, 400 miles 400 miles". I mounted them and he put them on. While he was putting them on his car, he said "this one is dry rotted"! I said that was why I had you put that one and the other like it on the back! It didn't take 2 months and one blew out in his dad's driveway. Don't put old tires on your truck! Please!