Rode this route today, it was a lot of fun, thanks for posting it. Up until about Twin Lake you’ll be on pavement as much as gravel, after that it’s a mix of gravel and two track. Once you make the right on to the second part of Crocker it’s going to be sandy ORV trail and I recommend you drop your tire pressure as low as you can or you’ll be doing a lot of walking. Same one you leave Holton turning on to Whetmire. I had my front at 20psi, back at 25 with 40c tires on my gravel bike. Took me just over 4 hours but I was taking my time and enjoying the trails.