I welded the bed to 2 pieces of 3x4x3/8 angle that run from front to back. They will also serve as a mounting point for a gooseneck plate. I have 2 pieces of 6" channel on the front part of the frame and 2 pieces of 4" on the rear that give the angle a level surface to sit. It's coming together. Got to finish welding today and drive about 12 holes for bolts. I'm an over doer so I will weld and bolt both. I used 6" on the sides and 4" crossmembers and with the bevel on the channel the 4"sit perfect for the lumber to sit level with the sides. Got to order some stake pockets for the sides and build a headache rack. Wish I had a bigger garage.