There is no law against hauling your own fuel. You can buy 40 -300gallon fuel tanks and a 12 volt pump to with a long hose. We do it all the time to out farm equipment. I don't know about a ground, we've never used one. Just be sure to get a pump rated for gas. Some are rated just for diesel. Gas has no natural lubrication and the pump , if not rated for it, may lock up.
You can buy tanks from Northertool.com