[capnduane]

I overlaid the original wood bed in my 55 2nd with a sheet of 5/8" plysawn exterior plywood. The ply is held down with deck screws, and finished with Minwax stain and seal. I keep the truck covered at night but it is out in the Calif sun most days. Still looks good after 2 years, could use another coat of sealer..... Plysawn comes about 48 1/2" wide, so there is a small gap at the sides which could be covered with a angle strip.