In my 30 AMP MH I replaced the rear 11K AC with a 13.5k and front 13.5K with a 15k heat pump.
I added a new 35AMP(20-15)breaker box in the outside compartment right below the MH breaker box compartment.
Ran the 20AMPwire up to the OEM breaker box area. Cut the wire from OEM front 20AMP AC breaker to front AC.
Installed a female end on the wire from the OEM breaker box.
Installed a female end on the wire from the new below breaker box.
Installed a male end on the wire going to the front AC.
Now plug the male AC end into the outside box when at campground. And when traveling I plug it into the OEM breaker box so the Generator can run it when wanted.
From the new box I use 30AMP cord to 30AMP shore box and the 30AMP MH cord to 50AMP shore box with adapter. I also made myself a custom 50AMP dog bone to 2 30AMP. And have only needed to use it one time so far. But it did work OK.