I always like the flashlight in the driver's mirror. It always kills their night vision, and its hard for them to shoot what they can't see.
I once pulled a vehicle that looked like a load, but didn't end up being a load. I spoke the occupants in the car. More than I wanted to deal with on a solo stop, and back up being far away. There ended up being nothing illegal about them; however, something was wrong. I got the, for lack of a better word, "violence vibe" once their night vision began to recover. So, I would sweep their faces with my flashlight and it took the agressive look of their faces, as they struggled to see. I concluded the stop, and left, in one piece.
You can't underestimate the value of a good flashlight at night.
Glock 17, 19, 20SF, 21C, 22, 26, 27, Glock E-Tool, Glock knife
Quod ego haereticus appellari sequere Jesum.