On the desk today, we have a auxiliary tank from Safari Equip. These are designed to increase your fuel capacity for traversing greater distances, whether it is driving across Texas, a long road trip, or if you plan to be out in the bush for a few extra days. This particular unit is designed to fit a D90, and offer an additional 30 liters or 8 gallons of capacity. These mount directly to the frame, and come with all of the fittings and mounting hardware.