so many numbers on tires...

OK, so I find the numbers on the tires for my truck a bit confusing. I am hoping I am towing safely... So I have a 2012 Ford F150 Ecoboost (4x4, supercab) with Pathfinder S A/T 245/70 - r17 tires. Then there is a whole bunch of other information that I suppose is supposed to be informative to me but I am having trouble figuring anything out... that A/T - does that mean All Terrain? And, what the heck does all terrain even mean? How does that compare to any other category? What are the other categories? OK, after the 245/70/r17 it says 108s (does that mean something)? I have a DOT information - but I can't figure out much about that either DOT H2CS YP5T (4513?). The tires have traction rating: A and Temperature rating: B. Is that meaningful in some way? And, I don't mean meaningful, in general, I mean meaningful in the sense that it would have an effect on towing performance for me... I have two pieces of information regarding plies - Tread Ply: 2 steel + 2 poly + 1 nylon, and sidewall ply: 2 ply poly. Is this OK? And, well, I see that the Max Load is 2205 lbs and the max pressure is 51 psi. From what I can tell, this is just fine - the vehicle has 5,476 pounds base curb weight, 1,660 payload capacity and 7,200 gross vehicle weight rating (GVWR). So, if I'm getting 2205 lbs of max load from each tire that will more than exceed the GVWR, so if I'm doing that I'm in trouble anyway. These aren't the numbers from the actual vehicle, but from the spec sheet, but I know when I've looked at the actual vehicle numbers they were very similar to the spec sheet numbers as well.



I bought the truck used, the tires look reasonably new - so my goal is to not change the tires without cause. That said, do I have cause?



For the record, I'm towing a 2012 20 foot flying cloud - so not a large trailer anyway...



Anyway, I did make some effort in trying to figure this out - and then I simply became more exasperated.



Thanks, in advance.