I only have a 1/2 ton but i think you have to bolt the cross members to the bed then place in the frame. I n my case I built the whole bed on saw horses and then backed under it and lowered on to the frame. Then taking a floor Jack i raised each point where a wood block was located and inserted the eccentric washer and bolt from the top through the wood through the cross member through the wood block into the frame. Repeated f or all six in my case then fine tuned the bed position and tightened all the bolts.