So you want a bumper for your new to you TJ Rubicon! For the rear I would go with something that is 1/4” steel with a 2” receiver Smittybilt and Best Top have nice bumpers for a TJ. When I had a TJ I had a Pro Comp bumper had 2 D ring mounts and a 2” receiver the thing was a tank. I use to live in LA and had to deal with LA traffic twice I was rear-ended, there was no damage to my vehicle however, the 2” receiver punched through their front grill taking out their radiator, so sad.
I really liked my TJ I think it was a lot more capable than my JKUR. However, having kids made me sell the TJ after 170,000 mile for the JKUR. You can do a lot more to you TJ 2 door without busting the bank, have fun with it. Jeeps are like a boat you put money into and never get it back.