Rent a car in Okinawa

hello,

i want to rent a car for my trip in Okinawa and I was wondering which type of car I should get. I don't want something big but I was curious about the state of the road when you go to the north. Are the roads passable (although slippery after rain) or not ?

because if they are quite passable, i will go for a small car like a Suzuki Alto or something like that.

Thank you!

by eu_ge_nie_