[rohrmann]

You should open(turn off) the main breaker and all the small breakers in your electric panel inside the trailer. Then, connect your inverter, and if all your cable and adapters are good, your inverter should not alarm. If all is good, turn on your main switch, and if that is good, then start with one at a time turning on the smaller breakers. You will then be able to isolate the problem. It is very possible that the extremely high load being placed on the inverter is making it think you have a short, when it is just to much load. 2500 watts is not much more than 20 amps, so you won't be able to handle much more than lights and the converter. You should already have the water heater and fridge switched to gas only as they will trip the inverter instantly.