We have used one with four adults ..two cases went in the boot..and two on the back seats with the girls..who are mid 20s and not that small..it was a bit tight but the trip to the airport is not that long..

We have one of our own now and the top is rarely up..I was not sure about using one in FL..but its more humid here in MA and sometimes just as hot and I've got used to it...great fun...wish we had got one years ago..