This is the Tumbler that Batman drove in Batman Begins and The Dark Knight. It was originally done to GTA:SA in 2005 by DieselGT, then I, Stene, converted it to Garry's Mod by request.
The model has some texture and scale changes. It was a fast port, so the physics model is also pretty much fucked up, doesn't have any gravity for some reason, so the model is only for posing.
I hope people find it somehow useful, but sorry, it isn't drivable, even if you add thrusters it just goes flying :(