If you have a fleet of 50 or more vehicles with a GVW of 12,000 pounds or less, you are eligible to register vehicles with a Fleet license plate. The FORT application is for newly acquired vehicles only. Once the vehicle is registered in FORT the Fleet Tag will be eligible to renew in Oct/Nov.
Vehicles in your fleet that are currently registered in the county where the vehicle is domiciled are not eligible for the FORT application. You will have to continue to renew those in the county licenses office.