Fun article in Slate discussing the widespread vehicle weight limits on CA's residential streets. It seems that, technically, most larger SUVs (BMW X5 and up) exceed the 6,000 pound limits in effect in many cities.
While I don't think enforcing such laws is a good idea, nor politically possible, I do have some issues with CA law with respect to SUVs. I think it can be summed up in one question:
Why is it possible for a 3-time drunk driver to operate an 8,000 pound vehicle, and to do so with only $15,000 of liability insurance?