Check out the Roadmaster spare tire carrier, P/N 195225, that mounts to a standard 2" receiver hitch. It's an option that you could also attach to the Toad's 2" receiver if the tongue weight became an issue.
Most folks overlook the ground connection. Measures your ground points to include front to rear. Dirt and corrosion build up are resistance to the flow of electricity. You may have to trim a wire and replace connectors to to lower the resistance.
