It's a Reliant.. Not very reliable, though. Why is it called that?
Nevertheless, it has three wheels.
Steam version: https://steamcommunity.com/sharedfiles/filedetails/?id=2580866409
Not a map; Contains only the .vox file for the vehicle and a .xml prefab.
Insert it into any map you want.
Use this as a base and make your own version if you want.