I have been roping cleat to cleat two houseboats together with bumpers between them on sandy beaches for three years. See the attached image. As long as the water is calm, it's easy to go slow and position them together. Once all the ropes are in place, it is a very stable situation. However, I have fears that a truly large thunderstorm with 1 foot plus waves, causing the sides of each boat to be at different elevations, could cause the tops to hit hard against each other. I'm debating if I want to continue this. Does anyone have any further experience in dicey weather with this configuration? Thanks.