How long has your AC run ?

My 2007 A/C was still running fine when I sold the rig last year.

You will be fine my 2012 works fine. In fact my pop up from 2000 was fine when I sold it a few years back. Probably works better then the new ones. In florida , last year it was on for a few weeks stright. Np.

A/C units from the 80's to today are very dependable. I suggest going up on the roof, remove the cover and wash out the condensing coils, Bugs and dirt do collect reducing air flow.
inside clean the filter inspect the evaporative coils and air exchange for good seals

Mine is from 2004. It works.

AC units can last a long time. You are lucky!

We bought our Sea Hawk new in 2002. Still on the original AC. The trailer lives in the garage when it’s not in use. Not sure if that makes a difference.

Mines a 2007, it is still going strong.
The unit on my 97 and 95 TT's both worked perfect when I sold them.

My thought is don't mend what ain't broken.

And I have always felt that old stuff was built better than new stuff.

I had a portable window AC I bought from Sears in 1974. I dragged it with me wherever I went, house after house. I even once rigged it into the window of an old TT years ago. I finally gave it away 2 years ago, still working flawlessly as it did from day 1, with zero service in 46 years.