30 A cable splitter, or something?

I would think your unit should already have this feature. Turning on the generator should do an autoswitch from Shore Power to Generator Power after a few seconds.

What does the manual say...

Roy Ken

Free Range Human wrote:
I'd be happy even if it required me to unplug from the pedestal first, just as long as the crawling-on-the-ground part wasn't required.

A 30AMP extension cord plugged into the generator and long enough to get out from under the slide might work and make it easier to switch between shore and generator.

What you are describing is an ATS (Automatic Transfer Switch).

If you install one and set up to favor the generator, if you turn on the generator, it will automatically switch to that (and only that) power source.

Yes, it is safer to unplug from shore power even with an ATS, and it sounds like that would not be too much of a chore.

Transfer switch.

You need to be aware that unless the generator and air conditioner circuits are completely isolated from the pedestal, electrically, what you are proposing to do will destroy the generator. We are talking explode in flames destroy. And they simply don't come from the factory wired that way.

It is a whole bunch less expensive to have the house/garage wired with a proper 30 amp, 120 volt outlet than it is to attempt to take the air conditioner off the pedestal and hook it up to the generator ONLY. And that is not even counting running costs for the generator.

If you do this, be sure that the electrician who does the wiring knows that the 30 amp outlet is NOT TO BE 240 volt, but 120 volt, lest you burn out every circuit and device in the RV.