in cpater 5 what harsh realities of life in the yukon does london describe in this chapter?

Two men from the States, Charles and Hal, buy the dogs and the sled very cheaply. Neither man looks like he belongs. The camp is shabby and sloppy. There waits Mercedes, wife of Charles, sister of Hal. Buck watches apprehensively as they clumsily take down the camp, improperly rolling the tent, and loading up the sleigh unevenly. Two other men from a neighboring camp warn them that the sled is too heavy, but they will not listen. The team cannot move the sled. They are repeatedly whipped by Hal, as Mercedes cries over them. Buck does not like her, but tolerates her pleading pats.