I know we always had to leave credit card details, even though we had paid insurances etc., up front.
With a prepaid card there is nothing stopping you from running it down to zero and the hire company would get nothing. As Til says, the credit card is pre authorised and so will be honoured.
Sharing from experiences of dealing with debt
The greatness of a man is not in how much wealth he acquires, but in his integrity and his ability to affect those around him positively.
Bob Marley. http://kallis3.blogs.iva.co.uk