"The motor roared up for moment" (8).
"The truck tires sang on the road" (9)
these quotes from the book The Grapes Of Wrath each personify the truck. Steinbeck does this to show how in this journey for the Joad family the car that they drive will just as important if not more important than each individual person. at least for the actually portion of the trip that involves driving. but right up to the very end of the book the Joads use their car for many different purposes. but even when this car is maybe their most valuable resource they do not have the ability nor the money to properly take care of it, which could foreshadow even more misfortune in the future.