For the railroad vehicle, see Combine car and for the passenger/cargo vehicle, see Combination bus. A combination car was a vehicle built upon a (usually Cadillac) "professional car" chassis which could be employed either as a hearse or as an ambulance, and had the capability of being swapped between those roles without much difficulty. These vehicles were upgraded by coachbuilders such as Superior, Miller-Meteor, Hess & Eisenhardt and Cotner-Bevington were typical of the era when funeral homes offered emergency ambulance service in addition to their primary trade.