I had a fat seat in my old 19ft MC prostar and it only had 250hp. I would only fill it up to about 900-1000lbs at the very max, and remember make sure you put weight in the front of the boat...that is very important. 900lbs in the back and 500lbs up front should be a good start. You can always add more if you feel confident that the boat can handle it.
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