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They are just rough hand sketches, but yeah, the drawbar needs to be long enough to allow the trailer to articulate (both side to side, and up and down) relative to the car. At least half the width of the car.
Deflectors on the car can't close that gap either, but I think some big trucks get part way there by using rubber deflectors mounted on back edges of the cab -
nothing gets damaged in the case of contact during severe articulation.
I understand this car to trailer gap is a major source of turbulence which will negatively affect the overall Cd. I don't know how big the effect is though?
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