What is the main cargo of the sled when the scotch hal-breed takes over?

In Jack London's "The Call of the Wild," when the Scotch half-breed takes over, the main cargo of the sled consists of a load of supplies, including food and equipment for the gold prospectors in the Yukon. The half-breed is depicted as a brutal driver who prioritizes profit over the well-being of the dogs, leading to harsh treatment and exploitation. This scenario highlights the harsh realities of survival and the relentless pursuit of wealth during the Klondike Gold Rush.