So I went to a deep dark place with my Truma in the past because I always had condensate dripping down the curbside of my trailer and none down the street side, or from either condensate lines under the trailer. The condensate lines cross so that meant I was not getting any drainage from the curb side condensate tray. There is a second outlet on each side of the condensate tray that is supposed to allow water to drain down the side of the trailer if the condensate line is occluded. To make a long story short, the condensate line that drains to the street side was occluded somewhere in between the inner and outer hull, and I could not access this area. I remedied the problem by getting a y fitting and splicing the tubing coming from the street side into the tubing coming from the curbside. I never had any drainage inside the trailer. I should also mention that when my trailer is absolutely level, the ac lists to the curbside.
Giving my experience, I would first remove the inner shroud and see if you can identify where the leak is originating. If you confirm it is condensate, I would then get one of these, https://a.co/d/0hkNDgD0, and pass the brush from the condensate drain tube as far as possible and see if it is visible from inside the trailer, since the inside shroud is removed. I would then do the same on the other side. If you determine one side is occluded, I used this fitting to splice the occluded side to the non occluded side, https://a.co/d/0d6K2v06. Maybe you will find a kink or other occlusion that can be fixed with out splicing.
I had the outer cover off several times during this process, but found that the access and visibility is poor and I would not start there.
I hope this helps, please feel free to reach out if I can help further.