This book follows the same story structure as Beep! Beep! Go to Sleep! The child protagonist is the adult, and his tantrum-throwing trucks are the kids. Get it? It's a metaphor.
Guy is going to be a great illustrator for this. He is known for animals, but I love the way he gives them toddler-like exuberance. The three grumpy trucks are just toddlers, after all. How great are these illustrations?
I want to frame this one and hang it on my living room wall:
And yes, he has drawn at least one vehicle in his life: