I have that plate on the TV, the heaviest motor vehicle I own. All of the other motor vehicles are compacts or sub compacts. I pay an extra $25 for an amateur radio plate for my "little car", a '97 Ford Escort.
Charges for plates in Florida are based on weight. No personal property tax, and if you are a 100 percent disabled veteran, your plate is $9 (not free, but the $9 is for "plate reflectorization") That DV plate also allows you to park free at any public metered space.