[Steeveedee]

Could just be that the drivers got shiny rigs. I pointed out to one of my sisters many years ago the difference in appearance between an owner-operator's and and employee's rig, when she lived in farm country.

When I traveled for business, I'd keep my rental cars clean (and even detailed them) and turned them in when due for service. Some people drove them with no cleaning and turned them in when the rental company demanded them back.