Use 1/4" lag bolts with corresponding washers to join all 2 x 4s. Nail plywood to 2 x 4 frame with 40 common 1 1/2" nails. A. Lag bolt (we suggest galvanized hot dip bolts all around) to truck bed from the outside using fender washers on all three legs. B. Three snap hinges (one on each post) will keep the bed folding smoothly. C. Two snap catches should be used (one on each side of the table).