I spent some time in the Marine Corps. And I grew up in the mountains of the PNW. Sleeping outside in the mountains of WA and high up in the CA Sierras, all over parts of Asia etc. etc.. I've slept on the ground, in snow caves, in the back of military transports of all kinds, on ships and in vehicles.
And I still don't get the RTT deal. It just doesn't seem practical. And every time I watch a good YT vid on the pros and cons from guys that use them. I always walk away glad that I've never had one. I'd probably get up to pee and fall right out. Or crush the thing. I'm 6'3" 250. Not to mention a "ladder". WTH? lol. You have to use a ladder to get in and out of your tent? Not for me.
All the added weight and bulk. Just doesn't add up to me either. You could have a really nice cot tent. OR full on heavy duty tent for a whole lot less money and weight (and hell probably a couple better upgrades to your Jeep for the price). And if you can't sleep on the ground. Consider a hammock or hanging tarp tent. Either one will get you up off the ground as high as you like. And will weigh a fraction of a RTT.
If you're that worried about bears. Consider a perimeter fence. One that's electrified if need be.
In the end I can think of ALOT of upgrades to my Jeep and/or camping needs for $1000-$2000+. For a grand I could outfit you in a top notch tent, cot or hammock and perimeter fence. And still have money left over.
I don't know if you have the room. But Iamjake on YT used to sleep in his Jeep full time. But he was alone, could afford to remove the passenger seat, and got a standard cot to fit diagonally with a few modifications ie - bending one of the front legs of the cot to fit where the passenger seat is. He had a hard top too. So that kept him in a fairly good safe weatherproof environment. He also liked the idea that he could get up and drive off without having to get out of his vehicle too. I don't think I could ever fit at 6'3". And usually camp with someone else if not more.
I don't even understand tent trailers. My father used to have one. And it just seemed like a lot of extra weight. Especially with how good camping and hiking air mattresses have become. They're damn near bombproof. And very very comfortable. And take up VERY LITTLE room. Like smaller than a Nalgene bottle. And insulated ones too. That keep you off the ground and warm down to very low temps.
I guess what I'm saying is there are so many better alternatives. I mean I guess if you were 5'6" 145 and already had a real roof rack. And you were 21 and didn't care about climbing up and down a damn ladder every time you wanted to get in or out of your tent. Then ya. I could maybe see the practicality. But even then. I'd advise you to spend your money on a good tent, a cot and an air mattress made for hiking. (Not the ones for when people sleep over in your house. Those are crap and will develops holes easily.)
Plus they weigh so much. I don't even have a roof rack. And even with a roof rack and a bit to much weight. Your looking at making your already short wheelbase Jeep that much more top heavy. I say bad idea. And if you think you have to sleep in the mud. I'd say your not looking hard enough for a good camping spot. Find some higher dryer ground. Or get yourself up off it another way. Like with a hammock or a cot.
I see RTT's kind of like snorkels. They're the latest cool thing that everyone has to have to look "overland". But really aren't right for their intended purpose. Other than that they make a good tree fort for the kids. But who needs a 400lb tree fort on top of their Jeep?!