Multiverse Truckers — K.G. McAbee

The Earth is split from pole to pole by the Rift: layered slices of various multiverses, all smooshed up against each other like pre-sliced bread. The first explorers came back damaged, mad or both. But intrepid drivers and their nuclear-powered AI big rigs can travel it, drivers like Seph and her AI truck, Buc. Then, something happens that could change everything...