If you haven't tightened those 4 "mounting bolts", you might try that to see if it resolves the "leak".
There is a history of some people finding the drain hole in the drip pan blocked by dirt or decomposed leaves. You can remove the top cover, look at the drip pan and check to see if the drain is plugged. If it is, that may be your problem.
Before doing that, I'd check the mounting bolts to be sure they are tight (but not too tight). I believe your trailer is a 2016 ?? If so, the gasket might have been compressed too much by tightening the 4 mounting bolts too tightly. If so, the gasket might no longer be sealing properly and might need to be replaced. That means removing the A/C top unit cleaning the gasket area and installing a new gasket. It's not a particularly difficult job, but takes 2 people to lift the top unit out of the hole, turn it "on its side" to access the gasket surface on the unit and then to reposition it in the hole after the new gasket is set in place.
I'd leave the "gasket replacement" as a final option if tightening the bolts doesn't work. Don't overtighten them, but keep them snug. The gasket does have a habit of "compressing and leaking" over time. That hopefully, is your problem.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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