The road is fairly decent to the Mill Creek Trailhead and you can drive another mile or two with a 4wd ,but probably can't drag a trailer.
Then you hoof it another 2 miles to the end of that canyon and start to climb. At that point, it's pretty much straight up except where the trail snakes up that canyon.
I rode my mule up there last year scouting and was not impressed.
Probably a lot of camps along that 4wd road.
