I don't ever buy the extra insurance. I have rental car coverage on my personal auto policy and primary rental car coverage on my Chase Credit Card. You have to look into your own policy if you have one or the policies of whatever credit card you are going to use. Usually it doesn't make sense to buy it, sometimes it does.
Tolls, IIRC Thrifty has a little box they mount on the windshield with a switch on it, if that switch is off then their toll transponder won't work. You can either get a Visitor Toll Pass while at the airport, pay cash or bring your own EZ Pass compatible transponder and use that to save what can be a substantial amount. In 2017 I paid cash for my tolls, and still got charged $20 because my passenger messed with the transponder and flipped the switch to on.