2 years ago I did a trip through those areas. A couple of other folks and I caravanned down together with our own cars. One of them had a convertible. She would sometimes have the top down with no A/C on. Other times she would have the top down with A/C on. And other times she would have to raise the roof and have the A/C on. No biggee. And she sure had fun when she had the top down. I envied her that. Best of all worlds, I say. If you can afford to rent a convertible, I say GO FOR IT!

If you check out this page at Edmunds.com it should take you to their page on the Sebring. Note that one of the plusses of this vehicle is the large trunk and if you scroll down, there is a photo of the trunk packed with luggage. Click on it to enlarge it. It sure looks like it holds tons of luggage to me. I can't imagine that the two of you would need anymore room than that.