I travel with an EZ Pass Transponder. There’s another version also but I seem to travel only in EZ Pass states. It can save a lot of hassle. Just remember to remove the rental from your account when you turn it in.
If you use a tollway, take a photo of your rental car and a close up of the license plate. Go to the tollway website and pay the tolls ASAP. That way the rental company will never get billed for the toll. This worked for me on a trip to the Chicago area where I used the tollways
Something similar happened to me on a trip to Australia. A month after we got back home we got a bill for a almost $200 for highway tolls in an Avis rental car. The tolls were just a few bucks but the penalties were time-dependent and kept racking up in the month it took for the notice to reach us.
When you go through customs in most countries they will check to see if you have any outstanding warrants or claims against you. I’ve heard that some countries have reciprocal agreements to share the information.
To avoid future problems I just paid the bill and had them send me an acknowledgement which I carried with me while traveling internationally for a few years.
I used Avis again and explained the situation to them and got a week’s free rental from them.