Do you have any kind of a frame that runs the width of the bed?
Here was my project:
https://ecomodder.com/forum/showthre...ast-24019.html
I leave it off most of the summer because I put bicycles in the back on weekends.
Has lasted the past 5-6 years now and still holding up to the winter.
I put it back on just a couple of days ago, a little faded, a little rust on some of the screws but otherwise good to go.