^Not exactly how they were designed but yes with a competent weld it would be fine.
It will also make the trailer useless for anyone with a real tow vehicle, in the future, when you sell it.
Since this whole escapade has gone unanswered whether you’ve towed it, ok with towing it, even know how it tows, if you go the mod hitch route you have a 50/50 chance of shooting your self in the foot by continuing to try to jam this round peg into a square hole. Figuratively and literally.
Next bit may not be well received but in general you’ve exhibited that you’re not the kind of “mod it and make it work” type of person. Nevermind the whole issue of actually towing it which has gone unaddressed.
Lots of campers and lots of cars and trucks for sale.
Maybe consider the option of finding the right camper for your car or getting something that will tow the existing camper without any fanfare, modifications, counting cans of beans and logging where you place them for weight purposes and all the other rabbit hole stuff that has been mentioned the last half dozen pages.
And if you change vehicles you’ll probably thank (somebody) once that Audi starts being an Audi and getting into your wallet. Which will happen quicker if you’re doing any real deal high mile towing with it.
