Just reading through the forum and a post relating to tolls reminded me to ask about our rental car and getting the toll pass with it.
We did this in Florida a few years ago and it made life much easier.
So, my question is, is this a state thing, or national? Just that we are picking up in DC and dropping off in Miami. Will we be able to get a pass that covers tolls for the whole journey (yes, I'll ask our rental company too, I find that TA often gives quicker (and better) answers :) ).