how's it hooked up now?
Mike, do you plug the gen into a receptacle in the rig when you want gen power? or do you have a transfer switch? What you have now, is 120VAC 30A single phase. If you change to a 50 amp service, that will be 240VAC single phase, with 2 poles of 50 amp power. More power, obviously, but more $, too. Panel, shore line wiring, shore line recep, etc all have to be changed out. If you have transfer switch, then It, too is probably rated at 120VAC 30 amp, which means it would be changed out, too. Not the easiest thing on your wallet.
Now, all ya gotta do to power the rear AirConditioner is get a dedicated 120VAC 20amp feed to it. There are many ways to do that. All I need to know is how the rear air conditioner is wired now-you can provide a shore line from the 120VAC 20amp circuit on the rv camp pedastle, or with a correctly wired adapter, you can power it from virtually any source available. PM me for more...