I had briefly considered buying a trailer that was for sale in NW PA (Erie, PA area as I recall) several years ago. It was an early 2000 model year, and either a 30' or 31" trailer, with the generator installed under the rear queen bed.
We had the factory option remote generator plug installed on our 2004 30' Limited. This included a plug at the front of the trailer, and a transfer switch hidden (too well, I might add) in a compartment in the back and beneath a rear twin bed. We bought a power cord at the factory that connected our generator directly to this plug, and whenever we ran the generator, the transfer switch automatically transferred from shore to generator power.