The New Blue Collar: Temporary Work, Lasting Poverty And The American Warehouse

"The difficulty of a lumper's day often went according to chance. A lucky lumper might be assigned a container filled with boxes of Kleenex or stuffed animals, while an unlucky lumper might pull a container filled with kiddie swimming pools or 200-pound trampolines. For the heaviest lifts, Dickerson would be assigned a partner, and the two would split the pay for the trailer, moving the massive boxes onto pallets by hand."