-- Last Updated: Sep-29-12 11:03 PM EST --
Something like this: http://www.flickr.com/photos/wwfloyd/3480392728/in/set-72157611497267680
edit: OK, this can only work if you're sure you have a waterproof hull to pour into... which OP will not, with the hole taped over.
4-place Boat Trailer
URCHIN Portable Anchor
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