Think post-apocalyptic cars and tracks. A game fitting this description was released back in 1998 under the name Power Slide. To be honest in my opinion, the best thing about it was the advertisement, which I've attached.
If you're asking for a post-apocalyptic mod, check out Javielucho's Mad Mod with any of the desert mod maps.
I haven't investigated the technical side of creating this mod, but in the future, I will take a stab at it. I've never created a mod before, but I write code for a living and have design experience. For now, I'm curious if anyone would even want to play it. Awesome to hear of Javielucho's Mad Mod! I was honestly hoping that I wouldn't have to create any cars. I'm most interested in creating the tracks.
So you want a mod for beamng that adds mad max styled cars (there's a mod for that already) but you want it to be inside beamng?
Mad Max styled cars and tracks. The mod you mentioned has no tracks. And if I didn't want it in beamng, I wouldn't have posted it here A Mad Max themed racing game would need awesome crashes.