Hey Dave
If they are getting 10,000 hours on the equipment every three years I wouldn't complain. I would find an appropriate depreciation schedule so I could write it off. On logging equipment, I used 7-year straight line minus salvage value....only because someone smarter than me said to do it that way.
What is your final product? Sand or gravel, not sure what you were looking for.
If pit run wasn't available we would bring in a crusher and shoot for 3/4 inch minus surface material. Don't remember ever laying down less than 6 inches on a road as it has to last.
I'm just curious Dave, and my questions have nothing to do with the basis for your response. If you and I share one thing, besides racing, it is mistrust or dissatisfaction with the government.
Sounds like you are headed for retirement...all the best in that regard.
Later
Mort