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Hi all! I was looking at Promaster photos and I noticed that on some vehicles, there is a black, plastic-looking box on the roof over the driver's seat.
What is this for? Is it just an entry point in case you want to mount something on the roof? What do people usually use it for?

What is this for? Is it just an entry point in case you want to mount something on the roof? What do people usually use it for?