Ok so i found this article online which appeared to fit my configuration.
Rear A/C unit can be run on separate 20 amp shore power circuit – 1999 Southwind 35S
Since I am also replacing the 26 year old carpeting, I took up the sofa & found the junction box (see Pix) where the generator legs feed the rear A/C with 20 amp an the distribution panel with 30 amp.
I did my testing, disconnected the 14 gauge leads, did not plug the shore power cable into the generator outlet, fired up the Generator and no power to a/c.
So now I will split that circuit into a 20amp 125 twist lock, the 20 amp generator lead to a 20 amp 125 twist lock and create a 2nd shore power cable exclusively for the rear A/C. This way if I plug in either the Generator or the shore power