Fuel tank formed using 12 gauge stainless steel. 140 US gallon tank. The drop down area fits around the aisle way. Multiple tank outlets for engine supply and return, generator supply and return, and diesel fired supply and return. A lot of welding but finally complete. There will be a fresh water tank, a grey water tank, and a black water tank. Total tank capacity exceeds 6000 lbs. The frame will require beefing up. Sending unit on diesel fuel tank. Sending unit on inside fuel tank. Pressure testing and ready for installation.