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Hi, I'm Robert. Welcome to JustAnswer. I'm reviewing your question now and will post back with your reply momentarily.
So more then anything the labor will cost the most, the AC unit will have to be removed and that area will need to have some support put in, hard to say without seeing in person but I suspect it will cost around 8-10 hours of labor if the interior ceiling needs to come apart. A RV shop will charge about 1 hour to remove and replace the Roof AC unit, and when the unit gets put back on make sure they use a new gasket that goes between the roof ac unit and roof. I would say ballpark you are looking at around 1K it would probably take a full day of labor to do this type of repair.
Most RV shops will also give you a free estimate prior to repairs as well.
Hope this helps some, IF you have more questions or concerns please feel free to contact me, IF you are satisfied with my efforts please feel free to select a STAR rating on the page.
IF you also want to send me some photos that may help out as well, you should be able to add some photos into your reply using the paper clip icon, I am around daily and respond when I can...Robert
Hi was just checking in to see if my answer helped??? IF you have more questions or concerns please feel free to contact me...