If you have been stung by PlatePass toll charges for East Coast car rentals, I would suggest investing in a North Carolina QuickPass. The hard case QuickPass is not only compatible at all E-ZPass facilities in 16 states, but it also works with the Georgia Peachpass and Florida SunPass systems.

The QuickPass is able to do this as it has dual protocols (5.9 ghz for E-ZPass and 6c for PeachPass and SunPass) built into the transponder, whereas a generic E-ZPass is 5.9 ghz only at the present time.

If you get a suction cup windshield mount from an auto parts store you can move the hard case QuickPass around from rental car to rental car and avoid ever having to pay a PlatePass fee.

Confirmation:
https://www.myncquickpass.com/en/about/facilities.shtml