Circut breaker question

Like has been said, the 30 amp breaker inside the trailer will trip so it won't work. Like has been said, the only two solutions are to run an extension cord from the power pedestal to the second A/C, or to upgrade the trailer's power supply from 30 amp to 50 amp. Option two is neither cheap nor easy.

"If she used an adapter and plugged into 50amp would that cause damage to the trailers electrical system."
No, the input breaker on the trailer system would be a 30 amp breaker and would trip if the trailer (2nd AC unit) plus other things tried to pull more than the 30 amps.

Ken

She could run an extension cord from the power pedestal to the new AC unit. Needs a healthy 312 extension cord for best results.
Not a good idea to try to overload existing trailer electrical system.

Would not be good for it. The TT is rated for 30 amp service. If you want 50 amp usage you would need to change out the 30amp box for a 50 amp box and do some rewiring. Her solution to avoid that is to plug in the new AC directly to the power stand outside on a seperate circuit. Most power poles have a 30 amp, 50 amp and also a 15 amp service there on the pole.