Carl's motorcycle, pulled from inventory to carry him over uneven ground after the transport broke apart.
With the transport rolled onto its side and snapped in half, the group draws vehicles from inventory for the ride back toward the Saferoom. Carl rides his motorcycle, bumping over the uneven ground while Donut rides Mongo and Katia drives the Royal Chariot.
He is still on it when the world freezes for the blocked assassination attempt, and still on it when he shouts his realization about Epitome Tagg out loud.
A heavy motorcycle bouncing hard across broken, uneven terrain.
Carl's personal transport during the retreat from the battlefield.
Also appears in books you've already read — spoiler-safe to their endings: