Unless the farmer is still milking and filling the tank when the milk truck comes. Which isn't permitted (at least not in my state) - the tank can't be filled w

Unless the farmer is still milking and filling the tank when the milk truck comes. Which isn't permitted (at least not in my state) - the tank can't be filled while it's being pumped out, and it has to be cleaned after emptied. The larger farms probably have multiple tanks and it's not a problem, but smaller farms don't. So if the milk truck driver follows DST, then you do too (or you need to pad your schedule by an hour to allow for a smooth transition to DST, which can be hard to do when you're first on the route and he comes at 7am)