Fisher Price Rock 'N Rumble Adventure The more kids shake it, the more tough terrain it rumbles over with its 4x4 climbing action The Big Rig comes with a sign, exploding barrels, and rumblin' engine sounds Any of the Shake 'n Go vehicles--Mud Eater, Sand Blaster, Car Crusher, or Rock Climber--can use the Rock n Rumble Big Rig. (Vehicles sold separately and subject to availability.)