Personally I think the busy should be only one way. There are very few sections on that trail that allow vehicle to pass without requiring vehicles to go off the trail. I think seasonal or annual rotation of the direction would be good for the trail actually vs always running it in the same direction.
I like the idea of having it a two way trail in the summer months, it was the way for 20 something years. And I'm the sure the guys that built the trails (small tire Jeeps) wouldn't drive off the trail to go around someone stuck:stirpot: