rubi is the only model I would go preowned. Mainly because of the 4.10 gears. And ONLY if in pristine condition. Hard to find one that hasn't been used for its intended purposes.
Most will tell you to go new because of the high resale of wranglers and warranty.
I was able to find one with a small amount of factory warranty left and saves over 10K over a new one.
I have not had any big problems. Knock on wood