I have a 1x4x8 with the lights on it. there is 25' of 4 wire hard service cord
(16-4 SJT) going to the trailer plug. I drilled 2 holes and put a fat bungee
cord on each end. (cut a long one in half, figure 8 knot behind the hole) I
can bungee it to the boat or just to the rear rollers if I am moving the empty
trailer (or something bulky from the Home Depot). Location of the bungee
depends on what you tie it to the boat on.
Tag is on the board under the light with the clear bottom. (handy if you have
more than one trailer in a non-title state). Put a couple of big "C" shaped
coat hooks just inboard of the lights for the cord and it all wraps up nice and
sits in the corner of the garage. I used western red cedar for the board and
sealed it. I imagine my kids will still have it.