If I did that they would nick my car as well??
I even have to take my hose,pump,pole and battery off the trailer every night, its a pain in the a**e but safer that way.
It all cost to much to take a chance, when I have the lid built I have made my self a post to stick 2' into the ground, and I welded a tow ball to it, so I could lock the trailer to that.
My Trailer is fitted with a Jocky wheel, and back legs.