Originally Posted by JWM59
I have always had plastic liners and never had a problem.
This might be an issue of use. If you baby your bed with a plastic liner, it might never become a problem. The man who owned my Dakota before me with a drop-in regularly abused the bed with heavy loads like cement, sand bags etc. (guess he was a mason as that is what I found under the bed) But it was definitively scarred and rusted through after 3 years.