Hey Supercrew, Got one of those towing guides. Interesting thing in there that was important: Just my going up to 265/75 R16's from 255/70 R16's cut my towing max by 500 pounds (because of the reduction in effective gear ratio from 3.55 to 3.38). Something to consider when buying tires. Now I am down to a 6100 pound max on my truck. I think the next set will be 265/70's in an LT if I can find em.