CLICK HERE for a PDF manual of the transfer switch.
The transfer switch has two relays, one to transfer the neutral and one to transfer the power. De-energized state is shore power while energized is power from the generator. In other words as soon as you plug in to shore power the coach will be powered up with nothing else happening. Switching of the relays occur for the generator Beyond the transfer switch the other common point is the two 50 amp breakers in the coach.
For the OP - first, with the shore power unplugged and the breaker(s) on the generator tripped, do a visual inspection of both the transfer switch and breaker panel. Anything burned is not good and will need further attention. Check all the wire hold down hardware in both. Give ever screw a clockwise twist to ensure all are tight. Next take a look at the relay contacts. Hopefully the relays are open so you can see the contacts. If they look burns you can clean them up with 400 or so grit paper. Next, again if the relays are open check the movement between contacts. Should have positive spring tension and free movement between the de-energized and energized positions.
With power still off and if you have a meter you can check the shore to panel connection either at the relays or the bus bar. Use the PDF in the link above to check resistance thru the transfer switch. You should see a short. Power cord Hot 1 should be a short to Panel Hot 1. Same with Hot 2, Neutral and ground.
Not sure what else to advise checking. With the short time line probably the best option is to find a mobile RV tech. Replacing the transfer switch isn't difficult and should only take about an hour maybe two if it's location is less than fully accessable.
