I've been using the truck for hauling pretty big logs around the property and I was scratching up the bed even with the bed paint on it so I wanted to get a rubber mat. I found this one for a decent price so I thought I'd share it. It's 4x6 so it almost completely covers the bottom of the bed and it has holes so hopefully water won't collect under it. https://www.jbtools.com/buffalo-tools-tbm46-4-x-6-foot-truck-bed-utility-mat/
I used rubber garage floor material ~$45. Yours looks way thicker and likely offers more protection. https://www.ebay.com/itm/3741738242...gZtc4ZCSiC&var=&widget_ver=artemis&media=COPY
I went to the local Farm and Ranch and bought a horse trailer mat, 5/8 by 5X8-ft. had to cut it down to fit. But the fit is perfect.
