Small biz auto insurance to rent cars?

[Google User]

Does anyone know any insurance companies that provides insurance to
businesses that rent cars?

I have found one that provides cover for businesses renting
motorcycles and RVs, but not cars.

More specifically:
I'm thinking of starting a small business renting my car out. I live
in a popular tourist area and I have a convertible that would be
desirable. I want to do this because I'm going back to school soon,
but don't really want to sell the car, but need a way to pay for it.

I am pretty sure my personal car insurance would not cover this.

Any leads or other ideas would be greatly appreciated!