Best bed liner for body protection???

[bitchin85]

my trucks black and needs rockers. i wanted to weld new ones in, and instead of repaint, i wanted to do some kind of DIY bedliner about 6-8 inches or so up from the bottom all the way around the truck. who has done this? what kind of prep work should i look forward to? what brand looks and holds up the best? thanks guys some pick would be cool!