What is fullbox and what does it do? Used to close the Off-Road luggage compartments of Off-Road Mitsubishi L200 vehicles and make them useful. L200 accessory product. It can be easily installed in the luggage compartment of your L200 vehicle without piercing the hood. fullbox tailgate also known as. It is easily opened and closed thanks to the fullbox shock absorbers mounted on the rear chassis of your vehicle. Your equipment will not be damaged in rainy weather, camping or hunting.