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I used two sheets of 4x8x3/4” pressure treated plywood. I ripped the plywood to 2’x8’ to make it complete the front and the sides. Since the trailer is 10’ and the sheets are 8’ I used the extra plywood that was previously ripped to 2’ to complete the sides. I used a treated 2x4 to screw the plywood that was spliced to the 2x4 for strength. I drilled holes under the angle of the trailer to screw down the sides of the treated plywood. Very sturdy.