We had issues that i had "fixed under warranty" then i fixed it my self after i picked it up lol. RV dealer service departments are a joke.
My Window unit on my zinger was dripping inside. Im not 100% sure of the exact issue but i've modified the catch pan and pulled the unit out and used tyvek tape to ensure that the pan drains to the exterior. It seems to have worked.
the down side to living in michigan is that i only need the AC to work for like a week out of the year. Fix the leak and wait another year to try it out again ha!
Other than that it cools fine. Its not in the most optimal location to evenly cool the trailer but it does the job. It seems like it would be cheaper to replace than a roof top unit if it ever goes out.
I would say just keep any eye on it.