The 1950 Fageol TC Cargoliner. It was marketed as a "self-propelled trailer"; the engine was mounted in the middle of the vehicle. Only one was ever built.
A design patent was applied for; not sure if it was granted:
More: The Fageol 1950 TC CargoLiner – A Trailer Without A Tractor | The Old Motor
Previously:
1950 trailer truck airplane - GIF, video, and photos
Walking/moving trailer floor - GIF and video
Single tractor pulling 5 trailers - GIF
Tools for removing snow from tractor trailer roofs - videos and patent
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