[Moving this here from boat talk] Long story short, we've been fighting with our ramp for a while and i'd like some ideas on how to anchor it so it wont move. We have a very unprotected site and have some strong (40mph) crosswinds from time to time. The last anchors we had in place were 4 plastic tubs filled with ~400 pounds of concrete each, on each corner of the jump. Our lake level fluctuates about two feet several times a year and last time we had the jump in place, we think the lake level went up and pulled our anchors out of the mud (we have a deep muddy bottom) and the wind started dragging the jump around the lake. What is the best way to have the jump in a permanent position, while still allowing for lake fluctuations?