I've been working with GTSE almost exclusively since 2012.
Do you mean you want to add an RFID field to the Driver table, Device table or both?
The RFID, may need to be in the EventData table too, if the purpose is to assign a vehicle to a driver, or something along those lines.
Please explain how you need it to work, and what the purpose is.
Also keep in mind that the DCS or other communications code that sends the information back to GTSE will need to be modified to support the new RFID information.
Please have a look at my profile, and then contact me via Freelancer so we can discuss this further.
Sincerely,
John H. Ward, Jr.