Having the same issue as yours, the simulate physics greyed out is probably because the mesh doesn’t have a collision, the tutorial I follow is this(https://www.youtube.com/watch?v=5MR04Cg9RJk&t=333s&ab_channel=Klaus) therefore Im using socket as location for pontoons, then I have tried if i do pontoons on left boat body or only front boat, it float, but when I do on all 4 side, it sink 
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