One step is to look at these breakers as often being a series of breakers. The 30 amp is a BIG breaker, relatively speaking. That often means that when a 30 trips, we need to check the smaller ones like 15 and 20 and those may be located in different places.
It will take a look at the wiring to say for sure, but I might think this breaker feeds the
"coach breaker panel" at some other place. For a quick thought without looking at drawings, I might try a look down below the left drivers foot for a second panel.
We are not well provided with the wiring info but this is a list of breakers for your RV so look to find these for a check?
Also if you can access the inverter and converter, they often have things like GFCI to reset.
This is a snip from the parts catalog here on page 38 if hard to read: