gday mate
i work for a zodiac dealer and you will find the there are many ribs that will suit your needs.
up to a 3.4 meter in the cadet series will easily fold down and fit into the boot of a standard sedan, you just need somewhere to put your motor as well. this is why i would suggest a 2 stroke as they dont mind being transported on their side
a great budget package that will keep on going everyday is a zodiac cadet340 s with a 2 stroke 15hp outboard
this is a marine ply floor boat, that folds down into one bad weighing only 52 kg. otherwise you could look at a 340 fastroller with the same motor, this boat only weighs 38 kg.