I have been around Death Valley a handful of times, and if you are on "main roads" around there, your chances of needing chains are VERY VERY small.
Buy ONE set of cable chains, hide them in the rear under the cargo floor - and forget about them - because you will not need them.
But have them just in case.
Such gorgeous country around there. I dont know what way you are going in and out of Death Valley - but on the 190 going to and from, you pass through Panamint Valley (adjacent to Death Valley) - and a very cool, quiet little resort - Panamint Springs Resort - totally away from everything. The little lodge has a very cool little bar with a lot of REALLY GOOD imported beers.
If you have some time to kill, you could take the road through Panamint Valley - its gorgeous and just empty (part of the charm). There is a tiny little ghost town in the middle called Ballarat. Like 3 buildings standing, and a small gift shop that, well, is something out of a horror movie. Weird old guy that runs it and claims one of the trucks there was owned by Manson - but I think its a lie. The Manson Family DID hide out in this valley though at one point.
Anyway - that reminds me of a forum appropriate pic from that dusty drive that day of my car. The pics you see are from January 10th 2010 actually. Not too much snow - just the top of some of the mountains around there that year.
PAnamint Valley is just a good side trip - but hope you enjoy the trip you have planned!!