Well, my monthly accounts are 1" triggers with salt included that leaves it up to me to manage how I see fit. Sometime a light salt application, sometimes a heavy application no plowing, sometime plowing no salt, you get the idea.
My per push accounts are 2" trigger but want zero tolerance. SO that means salt fro anything less than 2". Than there are the few on call for salt what at this point have all change to salt when it needs it.
WOW, a 4" pushing for 6" trigger. What is your average snow fall? Even if you are getting like 200" a year what do you do for a 3.5" snow fall followed but 6" snowfall two day later?
I could not see that every happening here. Even if it did I would not be taking on that kind of work. I have had a few people call wanting bids for 3" trigger with NO SALT NEVER accounts. I said no thanks and pass on those type of customers.