I've got a 1999 Mazda B4000 with ~210,000 miles that had a plastic drop in liner for it's whole life except for the last few years. No rust only paint rubbed of in some locations. Oh I also live in the rust belt. Yes there is some rust elsewhere on the truck , even the frame but not in the bed.Seems like a good way to let water under the bed liner and eventually cause rust, but it ain't my truck, so you do you.
This isn't good advice, though. I don't want others to see this and think it is a good idea. Unless they like rust, of course.
So sounds like your advice isn't good either.
Yes I'm sure some do get rust under the liner but a shit load of vehicles get rust in all different locations.
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