Most of this grain went through L A Hearn out of King City mostly in there own trucks. They took one load down the steep way. And all where game to get towed up the short way, but took 2 to 4 mile oil field road back down after the first trip.
They always had driver that could find there way and get around. I don't know how well the chief book keep felt able repair cost per mile from some of them.

One we called Wild John always complained his new truck only had Cummins 250 and all the rest where 335's.

One of my buddies reluctantly hooked up to a set and used the hand valve to slide all the waaaaaaaaaaay down the slopes, only to be called out on it by the farmer for digging a trench all the way to the bottom.
Eugene told his dispatcher his Jake brakes didn’t work anymore, so no more for him from that place.
I had a walnut farmer try to short change me on freight by taking a fully loaded set down a steep lever road. Not a good idea when one doesn’t have any brakes on the trailers…his unauthorized use caused a wrecked set of trailers, spilled walnuts and soiled shorts. Priceless!