Refueling assemblies comprise a chassis, at least one fuel conduit, a plurality of docking-port valve assemblies, and a fuel-source valve assembly. Refueling assemblies may be configured to simultaneously refill a plurality of fuel tanks. Fuel tanks comprise a fuel-receiving tank chamber and may include a fuel-tank male threaded member configured to be operatively coupled to a fuel-receiving device to deliver fuel from the tank to the fuel-receiving device. The fuel tanks may include a coupling member configured to be operatively coupled to a docking-port valve assembly of the refueling assembly but not to the fuel-receiving device. Methods of refilling a plurality of fuel tanks comprise operatively coupling each fuel tank to a refueling assembly, operatively coupling a fuel-source valve assembly of the refueling assembly to a fuel source, and opening a main valve of the fuel-source valve assembly to permit fuel to flow simultaneously to the plurality of fuel tanks.