Back in 2011 when I had my F150, I had the plastic bed liner removed and Linex installed. The truck was 8 months old and the owner of the Linex shop called me in to see the damage the plastic bed liner caused to the bed floor. It was unbelievable how much dirt and sand got under the liner and the complete destruction of the paint/primer. I vowed NEVER to use the drop-in liners again.Most people removing their drop-in liner find a scraped and rusty mess, but good luck.
Don't be fooled with the assumption that the drop-in liner provides protection.