I'm thinking about adding fixed trim tabs to the back of our river boat to help lift the transom in the shallow stuff. My question is how thick of plate do I need to use for it to be durable and able to take the occasional bottom bump at speed? I was thinking 3/16-1/4" aluminum would be plenty but not sure. Also, what size of tab is overkill? I was planning on the tabs being full width of the boat each side of the motor swing and then about 10" back from the existing transom. I'll put a gussett on each end and possibly in the middle if there is too much flex.