I have found a truck I like and it looks to be very clean, but it has 254K miles on it. They seem like they are all highway miles, but I am not sure. It's a '01 2500 4x4 ext cab 5sp. I am too far away from it to just go and take a look, but the salesman says its tight. It's up around the DFW area. I am wanting to know what things to look for to know whether or not I'd be getting a good truck?