I live in upstate NY and use the NY Thruway occasionally. I have two EZ Pass transponders. One is for passenger vehicles (including my truck when it is not towing anything. The second is for the truck when I tow my TT. As I recall, when I contacted EZ Pass about this they recommended the second transponder because it would result in the correct (lower) charge. I could use the regular transponder, but EZ Pass would calculate the toll differently. Your best bet is to contact EZ Pass directly and get all the facts.