Oh, thanks kyfooter that is clear now!
Actually, I have 2 train rails on eack side of the boat of 220 LBS each, one other in the bow and when needed, I have a fat seat + 1 fat bag
I haven't tested yet due to bad weather but I am confident it will be great!
One other question: yesterday I just make a small run on the lake and a the end, I start the pump to exit water and when I stopped the boat, I saw a king of foam on the dock. Like meerschaum but I ride on a non salty lake. The boat was use in salt water before, do you think it came from here?