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Re:Internal documents reveal the grueling way Tesla hit its ... by rootusrootus on Tuesday August 21, 2018 @02:11PM (#17812206)
These days dealer prep mostly involves taking off the plastic paint protection film, removing any other hardware that protects the car during shipping (suspension blocks, door bump pads, etc), checking functionality of major components, verifying fluid levels, etc, and finally detailing the car (well, washing and vacuuming at least).

You can actually find the dealer prep checklist for a lot of cars with Google, for example GM has theirs freely published on their public web site.

Re:Internal documents reveal the grueling way Tesla hit its ... by lostlogin on Tuesday August 21, 2018 @02:37PM (#17812454)
That’s the dealers dealer prep. The dealer prep the op refers to is an area where they fix all the stuff done wrong in the production line.
Re:Internal documents reveal the grueling way Tesla hit its ... by rootusrootus on Tuesday August 21, 2018 @04:36PM (#17813545)
I can't speak for all manufacturers and/or dealers, but it is almost certainly the same people, or at least the same process. During dealer prep they will definitely fix anything broken, or damage to the car that made it past the factory inspector or happened during transit. And they will install certain options that you can buy but are not done at the factory, including installing parts that are prone to being damaged during transport (for example, the spoiler on my GM car is not optional, supplied by the factory, and has to be installed by the dealer body shop after the car arrives).