In the story Into the Wild what is a brief description of the bus that was left at the Stampede Trail?

From the text:

"On his second day hiking the trail, he comes across the Teklanika River. In April, the river is tiny and easy to cross, not anywhere near the rapid it becomes in August when Alex tries to cross back over it. He travels 20 miles inland and comes across the bus with its hunting gear and remarks on it as the “magic bus” because of its miraculous appearance."