I had my Scrambler undercoated (I do it with all new vehicles). Jeeps are notorious for rusting. It's not that they are any more sensitive, it's just that they often see worse driving conditions. Years later I Rhino lined the interior, under the hood and bed. A couple of years after that I did the Rhino lining to the roll bar. I ended up getting slightly longer bolts for the roll bar. Stock would work, but there wasn't much thread hanging on.
Keep them long enough and they evolve. From stock suspension I put on a spacer lift. Got some room for tires, but those lifts are far from the best. Did it right by getting a full suspension lift. That improved handling considerably. I've never had more that 2 1/2' of lift. My Jeep is mostly a desert vehicle. Not into rock crawling, although I did take it over the Rubicon in 1983 bone stock except for Cepek Ground Hawgs.