I went through the same debate.
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I said...Roof Rack and Rooftop Tent or Trailer with Rooftop Tent mounted to it...
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I went back and forth for a while and it came down to this.
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For one or two people? I'd go with a roof rack and RTT ontop of the vehicle. I can fit more than enough gear to last a while in the back of my JKU with the tent atop along with a little extra gear on the roofrack. Most of the time I don't setup the tent until I am done driving for the day anyway, so I wouldn't be too worried about having to fold it up when I needed to move. And it's easy to do if I need to. A con though is that everytime you want to go on a trip you have to loadout your vehicle again and again. Also, you now have a tent atop your vehicle 24/7 even when daily driving.
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However, for a family or 3-4+ people? A trailer for sure. I went with a trailer because I had a son right when it became decision time. And let me tell you, it is crazy nice to have a trailer to haul gear for a baby, haha!! I can fit pack and plays, toys, extra supplies, and even a camping high chair in my trailer with ease. This allows me to bring the whole family with the gear to support them into the middle of no where. Also? The trailer can stay at camp and I can play with my Jeep without having to change a thing. Just disconnect the trailer and go. And? When I am daily driving, the trailer stays at home without interfering with vehicle performance. And finally? The trailer is sitting ready to go right now. I just have to throw some clothes in the bag and load some food and the whole family is ready to go camping within an hour. Pretty nice!
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So in summary? Are you planning on going on your own or with a friend? I'd stick to just the vehicle. Are you planning on supporting a family or group while out on the trail? Then get a trailer!
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PS: My trailer goes anywhere my Jeep goes, including hill climbs, rock crawls, and water crossings. I haven't felt limited yet. But I also have been on wider trails lately...really tight ones can change my tune.