Thanks for all of the compliments. We put a lot of time into the design of rear and the front bumpers. Honestly, protection in the rear was one of the least important items. We contemplated wrapping the bumper to offer side protection, but most of my off road travel is high speed and in the desert. My truck is pretty big for extreme rock crawling. Having said that, the rear bumper is 3/8 steel and has internal reinforcement. It also has 1 inch thick plates that secure it to the frame and protrude from the rear offering anchoring points and some protection. For the most part, the thought is that the vehicle behind me, unless it is one of you, is going to slide underneath. There is a downward slope to the back of the bumper that would assist this and also helps maintain approach/departure angles (assuming the trailer hitch is removed). There is always a trade off. The front is a different story and I pity the person, or animal that gets in the way.