I know this has probably been answered, but is it me or does arc welding on your rig engine on(to run the atl.) a lil dangerous. The only time I have seen welding done to a vehicle, they took out the gas tank and flushed the fuel system. Also i picked up the JPmag(April) yesterday and it has an article on arc welding with batteries. pretty interesting, alot cheaper than buying on on-board system. I would love to learn how to weld and have a unit, any suggestions.