When the Commonwealth of Massachusetts shifted away from tollbooths on the Pike & elsewhere they dropped the mandatory use per period and impose a $1.00 service fee when billing for photo tolls.
I applied online and was sent a transponder last fall. I was unable to specify the correct specific vehicle ID for our rig and visited thier office in Auburn to resolve it.
I was told the visit was unnecessary their system would correctly charge me. The CSR offered to provide and setup an additional transponder for just our TV if I intended to travel bobtail.
In Mass I can use the express lanes while towing. In all other states I must use the EZ-Pass/Cash lanes, if available, so the attendant can count the tires & axles.
Even with this convenience I always carry a roll of quarters in our console to lift the gate if the transponder should fail. (Unmanned exit toll) I may abandon this if I have no issues in the next few years.