OK, I can see why you are asking. I'm not familiar with IKamper so I went to their website. I believe you are referring to their Skycamp 3.0?
They advertise that this tent alonei is 165 Lbs. If you ask both Thule or Yakima what their sport bars are rated for, 165 pounds. If you read their fine print, that is 165 pounds, including the weight of their racks. In other words, they aren't testing for these loads. Oh, but don't worry, iKamper says that they advertise that "We conducted over 2,175 miles (3,500 km) of driving test across various environments, including highways and unpaved roads ........" That tells me that they are asking their customers to test and you would also be testing your sport bars for above their ratings ..... you get the idea, I don't like what I'm reading. I could go on but I hope you get the idea.
I'm sorry if I seem harsh, but when planning a long expedition, your need to "read the fine print", so I probably look at this entirely differently. I would suggest, turning the whole question around. Ask yourself, what do I wish to achieve here? Think of a roof tent, not as a vehicle accessory, but as a piece of your expedition equipment, like your sleeping bag. You buy one that suits your needs for the journey or voyage and it will last a lifetime. Buy your roof tent to suit you and your needs, not what you think works for your vehicle and you will be your companion for a very long time.