Can someone tell me how a ground fault works on a engine drive that is not sitting on the ground or does not have a wire going to driven ground rod. My 12,000 watt home generator says it has to be placed on the ground when running to avoid getting shocked or possibly killed. Also could a ground wire coming off a engine drive's ground welding terminal to a driven rod help welding characteristics and safety. I know Miller has the specialists to keep things safe but I would like to know if it's safe to run a welding generator on a trailer that doesn't have a metal wheel or pad on it's tongue's jack stand to make a ground or a wire going from a trucks' bed to a driven ground rod.