I'd get bump stops before 3.0s. What gives people frame issues in the back is because the low amount of up travel. Where you run into issues is when the shock doesn't have enough travel to do its job. Bumpers/skids even without cutting the horns do make a big difference in the real world. It might not look like much but those few mm make a huge difference in approach angle. Though when you do cut the horns the approach angle gets that much better. People do it, but if you use your truck as a DD I wouldn't cut the frame. It gives insurance companies a way to not cover you if your in a bad front end accident. Especially if you talk about it on a public forum. I have been known to be called Fireman Dan or Ranger Danger but to me I just call it cautious... My truck is primarily on the street so the benefit/risk ratio is not nearly as good as others.