I took a set of semi chains and cut them down to fit my 35"x12.5"x16.5" BFG's. You have to cut about 6 to 8 inches off but they worked great! I also did this for a set of 33's too. I prefer the cam lock style over the p-wag chains! Just make sure you have them tight, I drive about 100' and check them again then do it again after you been on the road a little bit. And always have a chain tension cables on or bungee cords if thats all you have over the face of the rim! The tension will pull the chains off the tire and towards the outside of the truck if they do break, and not to the inside where you will tear up your brake lines, steering and just have a complete mess!
Ps. I run a snow plow in the winter for our City Public Works! 
__________________ VEHICLE: 2003 GMC Crew Cab Dually 3500, 63k miles, color matched grill/door handles, all emblems removed, billet grill, custom wheels (UGLY) PERFORMANCE PARTS: K+N Intake, Magnaflow 4" Exhaust w/ 5" tip, Edge chip removed (JUNK-blew out crank sensor twice)  EXTERIOR ACCESSORIES: Lowered 6" Front-8" Rear, C-Notched, Axle Flipped, Transmission Cross Member Raised, Firestone compressor and air bags, bullet proof steering tie rods with Heim joint ends, 3.73 Posi | 
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