Mary,
I got a dog screw at Home Depot, but I couldnt get it in the ground at your place at Tradewinds. I took the wheels out from under my HT and tied my trap wires down like Goran did. I think that a tight rotator mast, bows into the wind and no wheels/dolly would present the best profile to the wind.

I've seen tie downs cemented into the ground at Roton Point, YC, CT. They have a large cat fleet and a bunch of them are parked right off the water on a bluff.

Bill