Is there a problem with having multiple reservations with autoslash for the same dates, but with different car types? And then as you get closer to the reservation date simply cancelling one or the other? I ask because typically I rent full size -- but I notice convertibles are only about 5$ more for the dates I'm checking. I'm thinking that the full size are likely priced a little high and will drop more, but if they don't ... I'd just as well keep the convertible. So I was thinking of making a reservation for both to follow the prices.