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Johann Culemeyer of the Deutsche Reichsbahn Gesellschaft (DRG) was instrumental in the development of the trailer bearing his name. It had its origins in the DRG's realization that it needed to fight its trucking competitors by luring away customers who used the railroad to move their products but weren't close to spur tracks. The DR proposed to move customer's rail cars on specialized trailers with railroad racks mounted on them. These trailers were called Straßenroller, or "street scooters". The street scooters would be backed up to a ramp and the rail cars were loaded onto them. The scooters could be coupled together to haul extremely heavy loads or could transport tanks with the aid of a demountable platform. Prime movers such as the Kaelble Z6R pulled these trailers and could move heavy loads like transformers in excess of 60 tons. The road scooters are the ancestors of the specialized modular trailers currently in use around the world in heavy haulage by specialists such as Mammoet of Belgium.