could be worse , if you were doing it the other way they would stick you for a daily airport tax...for the length of the rental !!!!
personally if I wanted to go by road it would be greyhound ...british as well ! ; buy a ticket , second half price
for a bit more a 7 day go anywhere is possible ..have a look at their website
OR there are rail passes
OR you could rent a motor home [ no expensive motel rooms !] ... of course then they would be looking to gouge evry cent out of you , oil checking charge , extra mileage charge ......well , you have that message already !
but en route , DO NOT MISS ........well , thats another story .....23 years old ? won't tell you about my favourite bookshop in brunswick Ga