Had a similar problem back in 2012. I have a 2009 Starcraft 241RKS. After pulling into a campground and plugging into the power (30A), I heard a crackling, sizzling sound then no power. After T/S I found the metal junction boxes behind the cabinets that smelled, opened it up and found that the neutral wire wires worked its way to off and shorted to the box. The ground wires were wrapped inside so they were shorted directly to ground.
I ended up later modifying the system to the removable cable (Marinco). I replaced the home wiring with the same gauge all the way to the plug, installed the plug and replaced the end of the shore power cable with the female side of the plug.
Now I feel safer with no broken connections to my main power line!