I am so sorry you are selling American made Thor Rv's in Sweden. Thor has one of the worse Q/C and they send units out with poor construction. We love our coach and the layout very much, but that's about all we love. I think they send them out fast expecting the company selling them to do the warranty work. This way they can get more off the line and out the factory door. It is really sad. I feel your pain.
We had a lot of the same problems you are speaking about along with 35 other issues.
As for the wind sound above 50 mph we had same problem. Thor said they sprayed foam seal inside cap area. Possibly you know the area they are talking about. Not sure if it corrected it since we don't have our coach back yet.
I hope these are the only problems they come up with but don't be surprised if the have trouble and complain about the big slide. The system is very poorly designed. Ours is at the factory being fixed so we will see what they come up with.
Sorry to hear you are having issues and really hope you don't find any more.
Thor was a very well constructed coach until sales went back up, then they were pushing them out the door to make up for lost sales during the lack of sales all rv companies had. Example being, when we ordered our coach it took them four months to get it off the line and to us. We didn't mind waiting the time because we wanted them to take their time and make a good coach.