In this book grandson Ethan tells his friends about B-Doubles, what they are; the different kind of B-Doubles exist, why they are different, and why they are so important for Australians. The big machines fascinate him very much. From time to time he sees them on his Dad’s farm when they deliver feed for the cattle, or pick up milk from the dairy as they empty the milk vat after the milking of the cows has been done. He also tells them about his Granddad who drives B-Doubles interstate for a living. His Granddad (author) tells stories about situations into which B-Doubles get, about dealings with the road authorities, and about relationships with other road users. He also tells a bit about how hard interstate trucking is for people who are married. Not much is known about the life of interstate truckers and all that is involved in the heavy haulage industry. This book, which aims primarily at children eight to twelve years old sheds light on a national phenomenon that every one knows exists, but about which not much is really known at all.