I'me heading to Vegas in about three weeks. I reserved a car through Budget using my Visa. Years ago I reserved a car through Enterprise and was told that Visa offers free car rental insurance if you use it to rent a car. I did some googling and they do, but to what extent? Can anyone confirm this?

I have 21st Century auto insurance. Is it possible to apply my personal auto insurance to a car rental for a few days? How does that work?