Dual AC option on 27 foot trailer?

Our unit is 30' and came with a 15k BTU unit and a 50amp cable. I can hook to 30amp anywhere with the 50a to 30a adapter. It came with a 50amp cable because the bedroom is pre-wired for me to add a 2nd AC unit. I'd rather be prepared to upgrade rather than not have the option to upgrade due to being wired for 30amp. We live in Florida and there are lots of spots with no shade coverage. the 15k unit will cool us down just fine, but it tends to run for a long time when its super hot out and no shade. I may eventually add the 2nd one just to keep the bedroom cooler, but I'm in no rush. In a pinch I had to plug into someone's house to run the AC while my dogs stayed in the trailer and I used the 50amp to 30amp adapter and then plugged that into the 15a adapter to be able to plug in to the house. I checked everything periodically and the cables never over heated and it worked like a charm. Don't fear the 50amp!