Fastrak here but only good in San Francisco Bay Area as far as I know. For a yearly or occasional trip I wouldn't bother. You would need several transponders. We carry a change container and it's the co-pilots job to get the can and prepare for the toll. If she misses she loses her music choice for 100 miles.
It is a very good question as to how the passes handle the toad. I am sure the readers are capible of counting axles.
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2017 Gemini 23TR Ford chassis w/ power stroke 3.2
DW, Daughter and 2 dogs, Sofie (black lab/boxer) and Phoebe (schnoodle)
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