EZ Pass with and without trailer

In NY I need two responders, a white one for the truck only. When towing my two axle trailer I need to switch the responder to the blue unit. The unit not being used is put into a protective sleeve in the glove box so the reader does not pick up the unit not being used and being charged for both.

I am thinking seriously of getting a
Uni-Pass to replace my EZ Pass. It is accepted in all states EZ Pass is, plus Georgia and Florida.

I guess I can agree/disagree with all the comments.

EZ Pass website says you must have a different "tag" when towing a trailer.

EZ Pass Tag Order Form

After saying that, last fall I went to Rhode Island to pick up a couple tractors, towing a triple axle trailer. EZ Pass worked correctly in NY and Massachusetts using the transponder I always use with my truck alone.

Recently, I read somewhere (and of course I can't find it now) to tow a trailer you need to enter the number of axles and plate number of the trailer you are towing on the tow vehicle in your account.

^^^^. same here in PA.... Thats why I got the one for a trailer to use and not a regular one.....

I’m in MA and was told the same thing WNYBob is saying. I have 2 EZ passes and need to switch between them for truck alone and truck and trailer.

I was told here in New York State by the Thruway Authority that I needed 3 EZ-pass tags. One for my truck, one for towing a single axle trailer and one for my truck and my 2 axel camper.
Several years ago was charged the highest toll rate for my truck with a truck camper, over $50 to travel from Buffalo to Albany!
There was no cost for the additional tags. I just have to remember to change them to match what I am driving.

Nope! We have used EZ Pass with and without the trailer since 2004 and so far it has accurately charged us. The readers count axles after the pass and according to EZ Pass there is no need to register the trailer with them. We have had three different trailers and they got it right every time so far. Even the toll road outside of Charlotte NC got it right when we went through with the trailer one day and without it the next.