The hell...I have a pickup with bedliner that we use (in part) for picking up pellets for our pellet stove by the ton. They put the pallet on as far as they can while it's fully on the forks, then lift up the end of it and push the pallet on to the truck the rest of the way. No issues at all, and we've been doing it for several years now.

I throw all kinds of crap on it. A few years ago we were getting rid of fencing the previous owners had left...the only thing I had to worry about was them tangling enough that I wouldn't be able to get another piece in (we have a cap on our truck). That's the whole point in getting the bedliner. I'd refuse to help someone doing that.