I went on the Jeep Jamboree USA event on the Rubicon this past August. There were two JT Rubicons on the run, both owned by businesses, both on 40s. The owners/drivers seemed to have little issue with driving them on the trail. Neither one sustained any major damage. I was actually quite surprised how little the undercarriage was scrapped up on one of them. The break over seemed to not be an issue. I'm sure a good chunk of the problem was inexperienced drivers driving in unfamiliar terrain with a vehicle that isn't really a rockcrawler.
As has been said here and at that event, a JT isn't going to make a serious rock crawler.
However, here in the overlandy world it should be a perfect fit, especially if you have a small family.
Kevin