Here is another recommendation for the I Pass through Illinois.
They have no annual fee, just a $10 refundable deposit on each transponder and you only need to charge $40 to your account to get started.
We thought it was perfect for the sporadic use we will have. My home state wanted an annual fee, and we wouldn't even use a toll road in this state very often? Certainly not every year.
Illinois gave us a blue transponder for the MH and white transponders for the 2 cars. We use a PA toll road quite often with all three vehicles. Haven't had the MH on an EZ Pass road yet. I was told to put the Jeep transponder in foil and glove box while towing to avoid extra charges. EZ Pass will count your axles and deduct the proper toll from you account.