Convoy Trucking

I read the following here (http://wiki.sa-mp.com/wiki/SetVehicleNumberPlate):

QuoteNote: This function has no error checking. Do not assign custom number plates to vehicles without plates (boats etc) as this will result in some unneeded processing time on the client

So why we have random license plate generation for boats and planes and more vehicles when this generates slower performance?
My suggestion is that turn this function off for vehicles that don't have license plate.