Anderson plugs are a very robust and versatile electrical connector, and are used in many different applications, 50A grey Anderson plugs are commonly used for the connection between a 4WD and a camper trailer or caravan to charge auxiliary batteries or run a 12v fridge, and 50A red Anderson plugs are commonly used for solar connections and Electronic stability control (ESC) systems.
Anderson plugs are also a good reliable option for portable fridges instead of the usual 12v cigarette plug syle sockets that usually fall out or develop a poor connection on rough roads, as Anderson plugs connect firmly in place and can withstand a lot of force and vibration.