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'Not sure if this is helpful, but I recently got a Line-X spray-in liner and I think it's great. They do the inside of the box and the tailgate in any color you like. It's a tough, rough, clean coating that really looks nice and performs great. Things don't slide unless you really race around. They're not the cheapest thing though. I paid $450 for mine.
Ideally I'd like to spend $100 or less on a rubber bed mat and tailgate guard...I don't do alot of hauling but I don't want the bottom of the truck bed getting all scratched up when I do.