When I had my avalanche I would fill all three tanks, then fill the large fly high sac(500#) and place it on top of the port side tank. Then I would put a side sac(250#) under the port side seats. The stock rear tanks were about 250 each so if you don't have them just add another sac to each side. I love the storage in these boats, allowing you to have all your ballast hidden beneath the seats and not out in the open.
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