gulfcoast john":1679lnnb said:... Get a $4.99 Sun-Pass transponder for the turnpikes. It’s half the cost of ‘Bill by Plate’ with the admin fees especially when towing a boat. ...
I don't know about SunPass but for EZ-Pass you need to request a different transponder for use when towing. EZ-Pass toll booths are supposed to be able to automatically tell whether you are towing something or not by counting the axles. However, this does not work in all locations.
As a result I have two transponders, one for normal use and one for use when towing. Just need to remember to put the correct one up.
With EZ-Pass they say it takes two weeks to get a transponder sent to you so you can't get it at the last minute.