Thanks for the reply… I assumed that the best spot would be right around where the black line is but I won’t be able to put it there. I guess I have to go out and see where it sits after I fill up the bags. So once the bags are filled would the entire back end including the swim deck be under the water? If that’s the case I should be able to put it just above the black line like you said. For some reason I assumed that the swim deck would be at water level at surfing speed. This would not be the case?