I was told at americas tire 245/50/18 is as big as we can go in this rim , While buying a replacement for the stock Bridgestone .Not sure if it’s correct
Couple posts in the facebook groups that people went big to the point of rubbing and needed to add a lift. 255/55/18 on Falken Wildpeak A/T Trails I think (29.04" tall). Just barely acceptable on the 7" rim width but that can vary tire to tire so check manufacturer specs.
Are you looking more for width, sidewall to air down, or both? Something aggressive looking like the Wildpeaks? I went with Geolandar G015s (as did Subaru on their wilderness trims). For "recommended" size, if you end up any bigger in circumference you can't use the space savers or the stock tires as a spare without messing with the AWD system.. and potentially won't fit a 5th in the spare spot in the back
245/50/18 is 27.65" tall vs stock 225/55/18 at 27.74". I went with 225/60/17s at 27.63" trying to stay within about 3-4/32" and I can bring one of my winters as a full size spare on longer trips with the cargo tray sitting a bit high. May get a hitch mount/basket one day.