Just wanted to pass this tip along for those who use chains...when I mounted them on my 318 I would first jack up the rear axle, then deflate the tires. I was able to get a snugger fit of the chains and more importantly, I also used what is called a "quick link" to secure the outer side of the chains rather than using the standard connection. Much more secure and no way will that connection loosen. Don't forget to reinflate the tires.