Originally Posted by Fishstick8
I got one which mounts to my front license plate. Works great and avoids issue of having it under cap. It is what my ez pass recommended to not have an issue.
I was about to go this route for my unit, but then the issue of a separate pass for my toad came up with the I-Pass representative I spoke to. She told me that when towing I should remove the towed car's pass and wrap it in several layers of aluminum foil to prevent it from confusing the readers when being towed. Then upon arrival at a destination where car pass use might be needed, unwrap it and replace it on the windshield of the car.
Not wanting to deal with all that, I just remove it from the windshield of the Seneca at arrival and put it in the car. Based on my online account, every state seems to have no problems correctly counting the additional axles of the towed car and billing me for them!
P.S. I live in Ohio (an E-ZPass state) but I got my I-Pass before Ohio ever adopted E-ZPass. And I have close family in Illinois and travel there frequently. Plus Ohio initially was charging a monthly fee just to have E-ZPass, but I think they stopped that.