Unless you want to pull an "insurance job" you are better off paying 1 months rent at a local storage place. Most storage places charge between $50 to $120 to store what you have outside in a secured/gated lot. If you need to get to the boat ramps...taxi.
Down in S.FL, storage places have been poping up left & right.
I don't know of a single gated boat ramp with security down here.