Great report and you're very lucky that you're able to@ALEXB: Sure - the road, dry, is quite passable - bridges are no problem for either 2 or 4 wheel, so bikes with trailers shouldn't be any problem.
The issue is I'm not a master rider. I've gots lots of miles under my belt, but don't lay claims to excellence. That being said, I don't usually make stupid decisions and have therefore been lucky enough to avoid self caused accidents.
And this road took a LOT of my attention, focus, and intensity. Tiring for an old, lazy guy like me.
The kid, though; he's another story. VERY attentive to his riding. Knows when to be aggressive and when to back off. Not much of a risk taker. And I've put him in some very hot, very intense, very long days, both hiking and riding. For such a lazy a#$ at home and at school, he can buck up with the best of them. There's no one I rather ride with, to be honest.
I do suggest not taking Phanton Canyon Road alone. This is a place where if someone hits a pothole just right, fellow riders will be necessary to ensure a positive outcome for all.