Transformers Foundation: Book 4- All Fall Down

Hauler is one of the most unseen and unheard autobots of the classic Generation 1 series. Of those of us who know of him, fewer still know his origins.
When the war between the Decepticons and Autobots was fairly new, Hauler worked with his best friends as a Constructicon. Their greatest task to date was to complete the construction of Crystal City.
All Fall Down tells the tale of those days when the Consctructicons were not agents of Megatron. They were neutral bots who just wanted to fix the world around them and help wherever they could to build Cybertron.
This is the tragic fall of not just the Constructicons, but the loss of a family to one bot. And then... years late... a slight chance of hope.