The chapter that i found most engaging was chapter 13. As the faimly is driving along they talk about how they are scared to move to new land. They also meet the Wilsons in this chapter and decide to go with them to california.
At the gas station they talk about all the people stoping in to buy gas but have nothing to buy it with, i think this is a theme that is important in this book. This theme shows that people will trade anything to get gas to keep moving. Anything from there bed to the doll their child is holding, it shows just how desprate they are to get away.