"This black thing bolted to the back door hinges on this Jeep Wrangler. I’m not sure if it was on the other side also or not"
A: "It’s a fold down step to get to the roof of the Jeep for their expeditions to the mall and such. You can sell anything to Jeep people."
this is all lifted from a reddit thread.
https://www.reddit.com/r/whatisthisthing/
https://www.reddit.com/r/Whatisthis/
Most humor sites repost reddit stuff.