I am not aware of a specified capacity for the roof of the allroad, I believe there is a specified capacity for the rack but that is based on the strength of the rails and rather subjective. Ideally, your load should be spread across the length of the rails such that it is distributed across all of the mounting points between the roof rack and the roof.
Consider the difference between a static load and a dynamic load on the roof rails. A static load is a relatively constant load when the car is stopped vs. a moving/varying load while the car is moving. For tent purposes, your largest load will be when the car is stopped, and the load will be more or less "static". The roof will certainly be able to handle a greater static load than dynamic load.
The actual roof panel of the allroad is not rated for any load - i.e. your load needs to be distributed across the 6 roof rack mounts, with no load placed on the flat sheet steel of the roof itself.
Based on my experience with the C5 allroad, I think you will be just fine with 225kg of static load, and that 75kg dynamic load while driving. I am fabricating a roof rack setup which will incorporate a tent which completely replaces the entire roof rack, and I am going to be closer to 125kg static load with the roof rack, lights, antennas, a small flip down step ladder, etc... And I will be designing this for 2 humans to be added in addition to the rack and tent. I have placed at least 100kg of lumber on the roof rack of my C5's (with cross bars) many times with no problem.
My only caution with a 225kg load (i.e. "people in the tent") would be to avoid any major dynamic loads, such as jumping on the top of the car and such. Consdier that with 75kg static load, added 150kg of human, and one human jumps on the car as hard as they can, your peak dynamic load might exceed 300kg, if both humans were jumping at the same time you maybe could exceed 375kg, and maybe you would find the limit of the allroad roof :-)
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