Describe the U-haul story and it's importance in The Glass Castle book

A few months after Maureen is born, a squad car tries to pull the family over, because the brake lights aren’t working. Dad refuses to stop, and a high-speed chase ensues. Dad, fortunately, finds an empty garage to hide in, but the next day, he announces they’re leaving Blythe, because it’s become too hot to live there. They decide to go to a town named Battle Mountain in northern Nevada. Dad has done research on the town and learns there is gold there. So, they rent a U-Haul truck to carry the Prospector and the few other items they own. Unfortunately, there’s no room for the kids up front, so all four, including the new baby, must ride in the back illegally. his sisters.