i've heard of it before, but never knew you could drive on it. always thought it was a hiking/biking/horse trail only, and not for vehicles. anyways, from the pics it looks VERY tame - like 2wd fire road tame.
i believe Genoa Peak trail shares some of the same route and you will find much more info since this is the one vehicles drive on. Pretty sure the trail is mostly just a fire road and tame enough for a stock Rav4/Subaru.
if they're open in the winter, then maybe they'd be more fun with the addition of snow. if you're planning a trip, let us all know.