Hey Michael,
I have a 2013 JKU that as well is still pretty much stock. Concession Lake is a very popular trail, at Camp NL I took that trail the day before the big rain storms (first time on the trail) and it was a great one! The guides said that typically there’s a lot more water to contend with, as it was very dry. Dry worked for me, cause I don’t have a lift yet and it was nice to see the rocks and ledges before we drove into them..
Cheers!
Nathan