That trip was the first time I had taken it... I would suggest going as early as you can because you dont want to get caught up in the one way traffic.
I love and spoil my Rhino, and on this trip it got raped by some rocks. So prepare for some abuse, you cant avoid it, even my long travel arms got dinged.
I would also suggest going with someone that has experience on the trail, I honestly feel that helped me out immensely. If you can, bring a spare tire and tools to remove a tire.
Bring cash for the food at the Saloon, the fries are tasty.
Be careful coming back down (esp the last 10 miles), CraziCooter and I were going CRAZY fast... my speedo at times said 57MPH... you could run into traffic head-on and wreck.
Although it was fun doing this coming down that hill