How should the Bobcat 250 be grounded when mounted on a vehicle?

Connect a grounding cable from the equipment grounding terminal on the front panel to the metal vehicle frame using #10 AWG or larger insulated copper wire. Electrically bond the generator frame to the vehicle frame by metal-to-metal contact. If the unit does not have GFCI receptacles, use a GFCI-protected extension cord. (Page 17)