The tent depending on model will weight..... @ 250lbs at the most (72" wide ruggedized model with 2 sleeping bags) remove the annex and floor, you save weight, get a narrower model, again, save weight, get a thinner material, again save weight. But for worse case, 250. Thats a good solid US Male sitting in the middle of your back seat. The rack will weight... @100lbs. So 350lbs, toss some people in the truck to get an idea. But remember this static pre pack load. Now fill up with camping goods, do more than just you and maybe your girl go out? IE back seat being used with people. It adds up. Eventually you will need suspension, but if its just you, and you have not armored your rig, you should be fine. Now lets say you have drawers, fridge, full load out, 4 people in the rig, external jerry cans/ rotopax, upgrade the armor then toss in the rack/ tent, you will already be in trouble.
Bear in mind I drive an X not a JKU, but when I first got my X I had a garage of things to toss onto it. Since I know what I was wanting before I dived into this. I had shrockworks bumper/ swing out tire carrier, all skid plates, sliders, Gobi rack, full suspension lift, winch, etc. But I still had to work 60-80 hours a week. So I started easy. I put on the bumpers, and sliders, then the gobi rack. With the Pro4X factory suspension and a few hundred miles on it, I figured the weight pushed her down 0.5" give or take, the front would nose dive under braking, and I would hit bumpstops thru dips in the neighborhood I usually did not. So the next weekend I lifted her, no more hitting. I had over 3" of lift on top of the 0.5" I made back up from squatting due to the load of the metal added. I have since found the right setup where she sits about level when loaded, a little rake in the rear unloaded, but Im happy.
Great thinking ahead on what you want to do and what can occur first, but with a stock setup, and adding the rack/ tent, I think you will be fine, but it will be more top heavy. yet you will hear this often, your result may vary.
