I've been looking at buying a OBV with the gravity III ballast system. I really like to surf and will put a 750 in the glove box side rear immediately.

because it is almost double the size + the residual static weight why not just hit the switch twice to fill it up, that way when we want to board we can just hit it once and fill it to 400lbs. on each side.

Maybe this is just the engineer in me looking to make things easier, has anyone tried this?