Mark,

I use a very small folding anchor (the flukes are maybe 6" long). It weighs probably between 5-10 lbs. As long as the bottom is soft, it holds the boat fine even in 15-20 knots of wind with the sail up. I have a piece of soft styrofoam for a float, the line is about 12' long, I tie it to a forestay tang. Comes in handy and lives in my trailer box.