ooooh !! I do like your bath. What a view. When can I come over ???
Judging by my, 'now', experience of floating objects, I would say you need quite a bit of weight to set her to the mark. Have to tried pushing her downwards to see the forces involved. I reckon mine would take the weight of my Dog.
PS.. My first mistake was adding the extra batteries on the deck, and suddenly she tipped sideways. Didn't need to call for the 'Waders' this time, so no damage done.
Ken