I took mine off, as I thought they were unsightly. I would think all you would need to know is which one is generator (rear) and which one is toy tank (front). Any sign maker can make you a label with whatever language you want for a few bucks.
2015 Black F-350 Platinum Diesel Dually Crew Cab
2019 Riverstone Legacy 38MB (Full Paint/All Options)
2015 Voltage 3990 (Full Paint, All Options) Sold 6/18
2005 Harley Ultra Classic w/too many miles