For really aweful conditions, I am getting to be a big fan of the tandem
anchor idea. Essentially you put one
anchor down with 30 to 40 feet of chain that is shackeled near the end of a chain with a second
anchor on it. At worst the second
anchor acts a kellet but in the best case acts in tandem to split the loads on the
anchors so that they both grab and the apired layout keeps from being able to snatch the first
anchor out of the bottom.
Jeff