I have a plastic liner in my Ram that came with it used. I've had LineX in work vehicles; and it's pretty good. It does get cut if you have a lot of sharp stuff rattling around back there; but is just that small area, doesn't seem to just peel around the damage. I've done the Herculine once, hated it. Probably user error, but its not nearly as thick as the pro stuff, and did peel around any damaged areas. The plastic liner is terrible for stuff sliding around, But if your ever going to put a pallet or concrete blocks, ect in there, it does protect. I've also had the 4x8 stall mat style, that you cut to length. Mine didn't go around the wheel wells, and gas/oil/dirt gets in underneath. Works great for protecting, and doesn't slide.
Edit: I've started keeping a manhole hook in the truck to reach stuff that always seems to slide to the front...