I have a stock 2007 GMC Sierra 3/4 ton 4x4. Recently I got stuck in about 12 inches of snow. I was pulling a equipment trailer with a snow cat on it. Here is my question. I put cables on the rear tires. The manufacturer doesn't recommend chains. I'm not sure why. The cables were SCC, super Z LT. My tires are the stock 245 LT x 16's. I used the cables for the first time. I broke 2 to 3 cross cables on each side. the cables came off several times. These cables are 1/8 inch thick. The cable tighteners were too big for this set of cables. The tightener would keep the cables tight. I keep wire in my tool bag. I used wire to tie down the broken cross cables and tighten the cables up. The question is there some heavy duty cables I can buy for off road use? Should I air down the rear tires? I afraid to because I'm pulling a trailer. Any suggestions would be appreciated.