Do you have what it takes to be a tough truck? Rev up those engines with Hensel and Gretel authors Corey Rosen Schwartz & Rebecca Gomez and Will Bear Share? creator Hilary Leung! Two trucks off to school for their first day of class. One riding the brakes. One hitting the gas. Mack and Rig couldn't be more different. One loves the fast lane. The other, the off-ramp. But when they're forced to pair up on their first day of school, can Mack and Rig figure out a way to get along and learn what it really means to be a tough truck? Get ready to vroom and zoom your way to fun and friendship with these two lovable and tough trucks!