In my story, a group of people were stranded on an uninhabited 600 km2 sized island. They were forced to glide there due to fuel starvation of the airplane. Its only "domesticated" animal are feral pigs that survived on the island for decades. Without the availability of horses, cattle, llamas, etc, could humans turn the pigs into draft/pack/harness animals? Would it be effective? How would it work?
Btw, the people that first explored the island and let loose the pigs were living in the late 1800s, and the people who recently landed on the island are living in the mid 1900s. These people have "rediscovered" the island, since the first explorers died before giving any public proof that the isle exists.