The "normal" AS trailer has self reset breakers in the "distribution" block at the front of the trailer. However, the inverter "normally" wires straight to the battery. ( = it bypasses the distribution stuff). The gotcha is that the wire that enables the inverter may (or may not) be fed through the distribution area breakers.
As with many things electrical, the approach is to grab your multimeter (or get one if you don't have one). You start at the battery and make sure it has 12V
. Work from there towards the fuse panel.