Ulf asked: What is the maximum size allowed on an electric trike in Pinellas County, Fla.?
There is no size restriction on motorized scooters in state law.
s.316.003 – Definitions
(45) Motorized Scooter – Any vehicle or micromobility device that is powered by a motor with or without a seat or saddle for the use of the rider, which is designed to travel on not more than three wheels, and which is not capable of propelling the vehicle at a speed greater than 20 miles per hour on level ground.
I can find no contradiction to the above in the Pinellas County Code of Ordinances.