Blt2ski, It also says in the regs if you have a 4 WD with appropriate snow tires you do not need chains on pickup trucks only available in case you get in a bind.
I have an all-wheel or four-wheel drive vehicle. When "Chains Required" signs are posted, do I have to use chains?
No. All-wheel drive vehicles are exempt from chain requirements when all wheels are in gear and are equipped with approved traction devices, provided that tire chains for at least one set of drive tires are carried in the vehicle. See WAC 204-24-050.
As far as towing safely, it is the driver and not the gross weight. I worked in oilfield trucking and we hauled 140,000 lb loads on trucks designed for 100k. It's not necesesarily what you do , it's how you do it. I pulled a 32 ft Boles Aero from CA to VA years ago with a F150. Would I do it again? Probably not because it was a handful for me and I had driven 1 million miles then. I had to do it because I was pretty poor.