Wiktionary
backload
vb. To load toward the back, or towards the end of a period
Usage examples of "backload".
An hour later, the rest of the staff had left for the day, Demil's backload had been cleared, so there I was no evening shift.
Then along came an elder, trailed by a couple of stout boys sweating under heavy backloads that looked familiar: they were the quicksilver-flasks that the Doctor had bought in Leipzig, and that Enoch had delivered to them this very morning.