With their kids out of the house, empty-nesters Dan and Cristy Dornbusch cruise U.S. highways with an array of domestic comforts — TV, microwave convection oven, running water — in their vehicle.

They’re not just savoring the scenery: The Dornbusch duo operates a Freightliner M2 truck lugging loads of metal casting parts as a driving team for closely held Try Hours Inc.

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