Rental car insurance is a bit tricky. Each state is different, but, most personal auto insurance policies will only cover a rental vehicle when the policy holders vehicle is in a shop for repairs, so if you are renting a vehicle for business or pleasure, and not as a result of your vehicle being in the shop I highly recommend getting insurance. Be careful here read the policy on what is covered and what isn't, DO NOT trust what the rental place employee says, they are not experts and are there just to pad the bill as much as they can to make their numbers (quota). Loss of Use (LOU) is bs, its something that rental companies add to make money, some states allow LOU some don't. When I was handling subrogation demands for an insurance company I always denied LOU, and very rarely did the rental companies push to Arbitration. Enterprise was the worst, basically what rental car companies do is throw everything at the wall and see what sticks.