HD, I can't tell you how important the grounding thing is. When my boat was on the way to the river fresh out of the mold and hours of buffing and a wind and sand storm later. I pulled up to a gas station opened the filler and grabed the pump nozzle put it up to the fill and had a spark8 inches long arch ...I must say I was lucky no fumes I guess but it scared the shit out of me never the less. so make sure the tanks are grounded and your not sliding plastic tanks around on bed liners and maybe a rubber mat to set your gas dolly on , my 02