Before giving too much advice, I'd have to first ask what is your current level of outdoor camping experience? Are you a cot type of person or is an air pad okay?
There are many ways to skin a cat. If you've never slept on a platform before, I'd first start there (if that's what you're thinking). Also, consider how long you plan to sleep outdoors, proximity to "resupply" areas, and what level of "creature comforts" will you need. This is what ultimately will drive your build design.
I've known and wheeled with a lot of guys who did plenty of car camping, trail camping, and true, multi-week (month!) overlanding trips (I was also a Cub Master for 3 years). The thing I have seen consistent with those that I know of that are very happy with their setups: modularity. Almost everyone I know with a RTT has ditched it after a few years. A combination of difficulty getting in/out, the constant beating of wind and sun, taking it on and off when not in use (unless you're "one of those guys"), and general annoyance of having to pee in a Gatorade bottle at night or early in the AM gets old (note that I've never done it being a 6'3", 350 lbs, and a former D1 football player haha). Nearly all have switched to either a overland trailer setup, or have ditched the sleeping bed altogether and went with some high quality cots with bug guards. Most of my buddies that do long-range backpacking trips have also ditched their rollouts and inflatables for a quality cot and cover.
Another trend that I've noticed in both general travel as well as overlanding/long-range camping trips: simplicity. Ditching the "one item, one use" things in favor of tools and equipment that serves multiple uses has been a big driving force for overlanding and backpacking (it always ways, but has seen a surge the past few years).
My advice is to simply start camping (remote) out of your Jeep first and see what you need. Make note of things you used and stuff you didn't use. You'll be surprised at how light you can pack. Also be honest with yourself about sleeping. This is the #1 killer-of-joy on camping and backpacking trips. If you're not okay with stiff and perhaps less than comfortable sleeping arrangements, plan accordingly. Don't try to "tough it out" as you'll never want to do it.