I couldn't imagine surfing with only 700lbs of ballast. I think bare minimum for me to be able to free ride consistently (I'm 230lbs) is about 1500lbs. I know people who run a lot more, but I'd say if you can, throw in another 700-800lb sack in the back if you don't have 3-4 friends to sit back there too. I know Overtons has a 800lb sumo sack for about $100 shipped.
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