Rusty's my fav down in Moab. Love the boulder dropoff with the ledge on the lowside, and a cliff wall on the highside. (see pics). I've driven that trail both ways, which I guess isn't that common, in my CJ and the normal direction in my YJ. Watched some brutal rollovers on a couple of the first boulder uphill climbs also.
I was in Moab for the first time in April and ran rusty nail. "No Left Turn" isn't so bad as as a couple of later spots just down the trail 50-75 yards that are off camber toward the canyon. At least no left turn was off camber towards the wall.