The MG-36 is a supply car used by the Rebel Army. If you shoot the truck, food products will come out. Rarely, a P.O.W will come out. This vehicle is based on the real life Daihatsu Midget M4 and Tuk tuk.
Technically, MG-36 is not an enemy, only used by rebels and they also hide behind them.
MG-36 is also not to be confused with the real-life light machine gun (which is no longer in production).