If you're traveling Interstate 75 crossing the bridge between Kentucky and Indiana they get you both directions. They mail us a bill about 6 weeks later and Yoly pays it online. The notice that they send you includes the photo used for ID. I consider the $6.35 fee as payment for the nice drone shot I get of the camper going over the bridge. One time we drove across the bridge on our way to Travel Lite (northern Indiana) where we picked up our camper. I noticed an increase in the fee on the way back with the camper versus on the way there with no camper. I really don't know if that was because of the "cargo increase" or a time of day/night fee variation ?
I once sold a boat (and trailer) to a guy from Florida. He came up to GA to pick it up. A couple months later I start getting toll bills from all over Florida. I forgot to take my trailer tag off. Straightening out that mess was not a fun exercise.