I have a love/hate relationship with bed liners. I love how durable they are, but dislike the static electricity danger and potential for hiding rust. They are also very unwieldy to remove and reinstall each time if you 'part-time it' and you feel a load of gravel coming on. I put the front wheels on stands and pressure-washed the liner before I took it out:
When I removed the liner I was afraid to look at what I might find, even though it looked okay from below the truck. I breathed a sign of relief and grinned when I saw what was underneath: A near-perfect bed! It had some wear marks from years of rubbing or vibration, but overall very nice. Again with the pressure washer and I was happy.
I put the bed liner and its tailgate liner on Craigy's List for free and they were gone in a couple hours. The guy that showed up to pick them up was driving a diesel 6+6 crew cab. It was pretty ratty, having a bent-looking canopy that covered a bed full of 'who knows what kind of shit' and no rear bumper at all. When he emptied his cargo and started to put the liner in, he (we) realized that the top of the bed liner went over the truck bed, interfering with the canopy. At that point I wandered away and let him trim or whatever he needed to do. He got it all finished and I helped him put his canopy back on (he had dragged it off there himself!). We chatted a bit, looking my new truck over. I told him that fugly rear bumper was going to be coming off of there soon. "Text me when it does," he said, motioning to his truck, "as you can see I need one."