See I deliberately did it uphill because I figured if I ended up encountering something that forced me to turn around or back up, I wanted my escape to be downhill. After all, if I was able to make it across something going uphill without getting stuck, I can make it across the same thing going downhill without getting stuck. But the converse is not guaranteed.
The other thing with roads like this is that there condition will vary depending on when it was last graded and how much it has rained since then (as well as how much it has rained recently, which means mud).
When I did it there were a few things a compact/low clearance vehicle definitely would not have made it past. I don't find it totally implausible, however, that on one of the road's better days, this might not be the case.