Made it to just below the last set of switch backs before the upper parking area (about 12,400') in a 1996 Jeep Cherokee (just larger tires).
Creek crossing was no problem at any point in the day. There was a Subaru Forrester on the opposite side of the creek. Two main rough spots are same as described before, right around Pearl Pass Road junction. Two switchbacks in a row are rough but other than those nothing too terrible up to above treeline.
There are a handful of large boulders in the road above treeline, one of which caused us to stop on the way up in the dark. Clearly in daylight it could have been done but I was okay with the extra 1/2 mile or so of hiking. Slightly modified 4Runner made it to the top of the road. Above that last set of switch backs there are a couple of spots where the hillside is sliding onto the road meaning you would get a bit tippy and one pretty large boulder directly in the middle of the road. If you're going in the next couple of days there is some snow directly at the trailhead but if you got this far, you can skirt by it with a bit of rough road. Otherwise, that should be gone shortly.