The only 2 tires I am considering as replacements are the BFG KO2 and Good year Duratrac
So I think I would like to stay with P. Or is it really a "big deal" to go to C rated tires?
If I could get the KO2 in a P, I'd probably get them as the reviews seem to conclude that they are quieter on the highway, and I like the look of them a bit more....Leaning towards the Duratracs in P265/70/17
Since you've narrowed it down to two tires, you've already done most of the work. Duratrac in P seems a perfectly reasonable choice. I never considered Duratrac because the LT version seems to have no cap ply contruction (beefs up belt/tread separation resistance). Not claiming it's a huge deal, but it just seems odd to me for a modern tire to have omitted this simple, proven construction. I haven't looked into whether the P version has it (I'd guess yes) but that would matter to me, personally, and I would have to know before I bought it. I hesitate to even mention it, though, as there have been a ton of Duratracs sold and I'm aware of no separation reports so just consider that an explanation of why I didn't consider Duratrac. It probably shouldn't impact your choice.
I got the KO2 because of the claimed large increase in gravel abrasion resistance (I live in the desert). Depending on how true that claim is, I would also expect that attribute to have some compromising effect on snow and wet but that's just a guess. I can say I was surprised how quiet they are.
I was under the impression that more plys = more puncture resistance but the staff member told me that this is FALSE and more pls only = more load carrying capacity.
These days, it's ply rating rather than the number of plies, but the answer is kind of in the middle. Load ranges are about containing air pressure in service. With more air pressure and more load, naturally the tire needs to be built stronger
but it takes surprisingly little extra sidewall cord to bump the strength up to the necessary levels. So, in terms of
cord strength only, LT sidewalls have more puncture resistance but perhaps not as much as many think. Rubber thickness plays a big role in puncture resistance and that attribute is not consistent across brands and load ranges.
Perhaps I'll go to my local tire shop and ask to see a P and C in the Duratrac.
That's a good idea. Typically, there would be a difference in tread depth and perhaps a difference in tread aggressiveness as well. Nothing like seeing the tire first hand.