Pay for a linex or bullet liner.
I did the DIY. Pulled my plastic liner out, scuffed the bed really good, applied the liner which is a pain in the ass. Did 2 coats to make sure it is protected. First time I tossed my atv ramp in the back it peeled it right off.
My tundra I dropped it off, paid 500$ and have a lifetime warranty with no worries. Definitely worth the cost.