I don't know how it is for yall, but I've seen SurePost get some crazy volume outside of peak as a preloader. Granted, my view is limited as I only load 4 trucks and 1 has a regular post office stop. In the middle of the summer it had close to 300 SurePost (maybe 6 bags, the rest were loose) along with the regular ~330 rest of the package car. Fun day. But they all seem to be going to isle cars (rentals) now as I haven't had bulk SurePost for my trucks in two weeks or so.
I've got a few SurePost packages that have come down that didn't fit the specifications of less than ten pounds or some-cubic-feet metric, driver pulled 'em out and had a word with the sup. Is that common? I don't even have to deal with delivering the SurePost stuff and it confuses me.