If camping regularly in hot places with no shade, you're going to need a 2nd A/C.
If your trailer is wired for 30A, you should look into adding a 2nd bedroom A/C and having the power for it wired separately from your trailer. This would not be very difficult to do and is the only way you're going to get close to comfortable temps inside if camping with no shade in 100+ degree weather.
You would run a separate 115v line directly to the A/C and I would run the power cord along the wall in the bedroom then through the floor and underneath the trailer. Then plug that into the 115v on the camper post and run your trailer off the 30A/50A with adapter for the main trailer.
