I'm navigating the confusion of EZ Pass (what a mess it is!). I live in a state w/o any toll roads (other than a few private scenic drives to the top of mountains), but drive through a few neighboring states that use EZPass. New York seems to have the highest tolls and biggest discounts for users of the New York tag -- and New York is where I'll probably encounter the most tolls given that our son lives in NYC, so I think it makes sense to get a NY tag, even given the $1/mo account maintenance cost.
Anyhow, as I look at the website I see that the personal accounts are for vehicles w/ a GVW < 7000 lbs, and commercial accounts say that they're for businesses.
MA looks easier with no mention of GVW, and they have no monthly charge, but their tolls are so cheap in comparison and the discount for in state vs. out of state so paltry that I don't think that makes much sense.
...so, I'm curious what others in the north-east have done w/ their full sized Promaster vans.