Step 4Attach trailer to coupler.
To that frame, I added a large plastic tub with a locking latch lid to shelter what I am carrying in my bike trailer from the elements. In order to attach the plastic tub to the frame, I used two short sections of 1" X 3" dimension lumber that fit into the bottom of the plastic tub perpendicular to the trailer frame, attached the boards in place with Liquid Nails glue and through the bottom of the plastic tub with short wood screws, and then attached the plastic tub to the frame using 3/4" conduit clamps that bolt through through those short pieces of wood, the bottom of the plastic tub and the "ears" of the conduit clamps using 1/4" X 1 1/4" carriage bolts and nylon-insert lock nuts. I used two short pieces of board in the bottom of the plastic tub and two conduit clamps to create two attachment points for the plastic tub.
I also reinforced the lid of the plastic tub using a piece of 1" x 3" dimension lumber that spans the top of the plastic tub under its lid. I glued this board in place at its ends using the Liquid Nails and a short wood screw at each end, but also used 4 small eye screws that go through the side walls of the plastic tub and into the ends of this board. These eye screws will provide anchor points for bungee cords if I were to strap items to the lid of the trailer that is reinforced by the extra 1" X 3" board attached immediately underneath the lid.
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off the shelf parts