I bought the front skirt from CW and fasten it to the trailer with snap fasteners. I know I didn't like the idea of drilling holes in the unit for the snaps but once you do the first one the rest come easy.
Just make sure you use a very good sealent when you put the screws in. As far as holding it secure at the bottom, most people I see use pvc tube that they put water in for weight or sand and that holds them in place pretty good. Very nice for outside storage.
Dave