I have a set similar to these for my car that I've never used. They just happen to fit my camp trailer so I carry them when hunting to use as drag chains if things get nasty. I haven't needed them yet but I have them if I do. Trailer chains can save your butt sometimes.
Those "diamond shape" chains drive smoother, don't "lift" off the tire as much when traveling more 15mph, and consequently allow for more clearance on today's yuppie trucks--especially on the front axle. Of course, they're more expensive too.......