Working in the motor trade I leave the handbrake on and manual 'boxes in neutral, because I don't know what protocol the next driver to move the vehicle may employ.
In my own vehicle, I always leave it in gear/Park and don't pull the parking brake on mega hard unless on a steep incline.
Always leave vehicles on trailers/transporters in gear wherever possible, apart from Jaguar MkIIs which have a design fault causing first gear to come off the shaft if the car is pulled backwards.
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