Been awhile since I put a sheet of plywood in the.bed of my.trucks. Usually a stay in liner, Bed liner before spray ins. Plywood be for.that......that takes me back to before 1980!
I've used my trucks in construction, loading pallets of bricks, pavers, loading multiple loads of rock, soil and munches daily, along with.yard debris for rigs doing maintenance. Plywood makes it harder to clean the bed, and if you haul like I do, does not last but a month!
ALL bed type materials have plus and minuses, you have to choose what will be best for you.
Marty