For a move across town, we've started hiring movers every time - we're at the age where we can't really justify asking our friends to spend an entire day sweating just for pizza.

For a move across the country? There is zero chance I'd trust someone driving an 18 wheeler; too many friends have had their possessions disappear for weeks on end in a warehouse. If I were under a restriction similar to yours, I would rather move the boxes into the truck myself, and pay for the extra time it would take.