When we went in November a few years back, Moogie737's
Honda Pilot seems to have made it with hardly any difficulty. A score of 9 out of 10 was given because while blissfully discussing hiking plans for the next day over dinner, while sitting at the QC mine, the battery died.
FWIW, if you break down at this trailhead, you have a few options: hike to the summit to place a phone call if you stand there just right, or to wait for more folks to come up the road and hope they can help.
We did both!
I don't think I would have taken my 2WD VW up that high, but the previous TR does show two coupes (a Mustang convertible no less!) at QC, so it can be done.