Stovebolter, in the inside of bed on the rear corners,are panels ,remove those
and you will be able to get to the chrome bed corners,get putty knife and lift
the bed rails just enough to spray WD every 6or8 inches,on both sides,
they will slide out the back,that way you don't mess up the clips and reuse them..the chrome on the top are held buy bolt so you do have to remove
the rear of the headliner,if you use a steamer if will losen the glue enough
that you can carefully peel it back,, James..