Another reason is to avoid letting the inside of the bed get scratched. I lived in Texas for a while, and people were that fussy about their trucks.
As a european I would have thought having scratches in the bed and dirt on the bodywork would be a mark of pride.
First thing I did with my truck is get a spray-in bed liner.
As a european I would have thought having scratches in the bed and dirt on the bodywork would be a mark of pride.