A buddy of mine has a device he refered to as a Hammerlock...it is basically a square piece of metal with holes thru it that is cemented in the ground where your trailer axle ends up when you park the boat, then you have a squared off U shaped piece of metal with holes thru it that fits over your axle , you then have a metal pin that goes thru the metal where the U & square meet with a very large lock ....seems pretty secure but haven't been able to find it on the web.... found Hammerlock of miami which is where he said it was located but did not find the device.....I'll post it if i can find it. By the way Bro !!...Sorry to hear bout your boat.