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If the unit is roof mounted, I would have to say that it is a heat pump and there is an issue with the reversing valve or wiring to the valve. If this is the case, there is an easy fix and a expensive fix.
Another thought, alot of times folks will say it is putting out hot air when in reality, it is really just recirculating the hot air in the space. We expect cold air, anything else is just hot.
Swamp coolers work well in the desert, 10% relative humidity and less. You can expect a 30 degree difference. Anything above 10% dramatically reduces the temp difference.
A/C is really the viable choice on a trailer that can encounter variable enviroments. There are many options to replace it and no you do not have to keep the old one running. Just find a reputable shop to replace it.
In many cases, if it runs past 10-15 years it is a gift. Past the 15 year mark and it needs a major repair, replace it. I know money doesn't just drop in our laps, sometimes we just have to look at the bigger/longer picture.
Good luck
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