So I've researched this all kinds of places, and I can't make up my mind. I have a first generation Expedition, and the tires that are on it are fading quickly (after only about 27k...). Anyway, I think I've figured out what tire I want, but they offer both a P and an LT in the size (265/70-17). The door plate says to use a P rated tire, but I find myself wondering if that is part of the reason the tires wore so fast. The tires currently installed are General Grabber HTS which are supposed to be good tires, and I have liked them in every way except how quickly they're wearing. So I'm looking for pros and cons to the step up to a C rated LT tire as opposed to the P. The tire I'm looking at for the new set also has an extra 2/32nds tread depth in the LT version (18/32 vs 16/32). Any advice?