There are times when Caltrans requires chains, no matter what you are driving. A set of cables at Walmart is around $30 give or take what wheel size you have. You probably won't need 'em, but if they are required, it's a hell of a lot less than letting those roadside crews do a custom set for you. Which are very crappy btw. So just get a set, throw them in the back, and forget about it.