Second everyone's comments on the LED's, you'll love em.
Only thing I see from the photos, outside the bus issue, is it appears you used metal staples to tack the wires down to the board. Recommend if you staple to use insulated electrical
staples, or better yet use plastic wire ties to bundle your wires and then staple the tail of the wire tie or some such. Another good inexpensive solution is the rubber insulated hold down clamps that you can screw into the board. With the constant movement on the trailer over the years the metal staples can work through the insulation on the wires and could lead to some fun down the road.
Looks like your not too far from a "road test," enjoy......