It is very important you were running your AC with a 30 amp supply. 15 amps can damage the AC due to over heating.
You may have tripped a circuit breaker in the house, or whereever your source of electrical was at the time. Or you may have tripped the breaker in the Airstream.
So check all your breakers. Turn them off, and then back on to reset them. Verify you are delivering 115vAC to your trailer via the power cord. Make sure the AC and other AC powered devices are off or unplugged.
Your battery runs the 12v
circuits. If your battery is disconnected, then you won't have 12v
power in your trailer. 115vAC runs the converter and powers your 12v
circuits even if you don't have a battery. So if you loose 115vAC, you will loose 12v power too if you don't have a charged up battery.
Unless you smelled electrical smoke, you likely didn't damage your trailer (except for the AC if you were running on a 15 amp household circuit.)
If after resetting all the circuit breakers and verifying there is 115vAC to your trailer and you still have nothing, then you gotta start tracing down the problem.