my friend and i decided we are just going to build an in ground slider for this weekend. we will get it in the shallows and pound posts in for the base. We're planning to use 2x4's (probably 4-5 over a 12-15 ft span) and my question is how far would you say they need to be pounded in? The ground they will be set into is some pretty firm clay that we can pack tight around the base. SInce the lake is dropping, we will probably need to pick it up and move it over the course of our 9 day stay. Max height of the rail will be about 3 feet or less, so how much 2x4 should be below ground to make it solid? thanks
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