-- Last Updated: Feb-05-14 3:34 PM EST --
4wd Hardware has (or had) a good one. There are hardshelled covers that cover the little trunk area, which can be made lockable. A 2-piece paddle might fit in there diagonally. One-piece, good luck.
Here's an example from Bestop:
I had one like it when I owned a Wrangler. I never put a paddle in there, though--I mainly used the hardtop and even when using the softtop I just cable-locked the paddle inside and turned on my antitheft system. Hardly theftproof, but good enough for grabbing lunch on the way home from an outing.
Smittybilt makes another steel trunk that, although more expensive, makes a larger storage area.
Barring installation of items such as the above, your best bet for an unlockable vehicle would be a combination of out-of-sight plus locked to the frame, probably using a long bike cable lock spiraled tightly around the (encased) paddle). Good luck coming up with a system.
Rescue / Throw Bags
Wall Mount Boat Racks
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