I’m a MAN driver. My routine is to get out the truck when I’ve hooked my trailer up then immediately climb back up and check the hand brake is definitely on. Last job is to knock the trailer park brake off then stand by it for a few seconds to see if it moves.
The warning beeper is stupid. It beeps to warn me the hand brake is off when the ignition is on or the engine is running if I open the door but not when off. As I always turn it off when hookin up it doesn’t work. Why not beep regardless of the ignition key position?