My 2015 jeep renegade has the 18" wheels that I just love. I am not looking to really do any sort of lift but what is the biggest tire I can get away with, with the stock set up. I currently have P215x55R18? Wondering if there is alternative all terrain or highway terrain tire I can get as well. I like the look of the rugged tread! Any help would be greatly appreciated! Thank you!