The side AC is never going to cool as well as rooftop AC. I'm also stuck with a side AC unit and here's what I do:
1) use a roof vent with the fan to exhaust hot air.
2) Use a fan to distribute the cold air to the ends of the trailer.
3) I have blackout blinds to keep the sunlight from heating through the windows.
I haven't taken our trailer into Texas, but when it's in the mid-90's, I can only get the trailer down to about 80°F
Shane is right though, that the insulating of the cabinet around the AC unit is very poor. It may help to add some Sytrofoam and aluminum foil where you can to the inside walls of the AC cabinet. Also, if your current AC unit is a window mount type (they have outside air vents on the sides), this will also work against you. You want a through wall style AC unit. It's my understanding that makes a big difference. I believe some people have taped off the side vents, but I don't know what effect that could have on the cooling capabilities or longevity of the AC unit.
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