I was there and present in my 82 toyota. Yes we ran trail 1a backward at night. We got back to the parking lot at 11 that night. It was tight, very slow moving but we made it through.
Unbreakable was driving a 91 4runner, welded front, no power steering, no head lights and 35x15.50s on either 10 or 12 inch rims. He had a rough night to say the least. His truck was wider than a lot of spots, but he managed to muscle it through. He almost rolled countless times from having to drive up on the banks.
Me in the 82 and 1stgenxxx in an 85 runner made it thru with lots of dents and scratches, but really not a lot of trouble.
I can't really recommend that trail to anyone that cares about body damage, and without a doubt nothing bigger than a Toyota pickup.
That night, we did not meet another person. The trails were empty.
Here's some pics
Unbreakables runner trying to flop
1stgenxxx's main damage
And my damage, both sides of the truck just wrinkled and scratched.
This one almost got the windshield on all three trucks.