Well guys, my 320RS has NON of the operational and electrical problems you guys are talking about. You know by now if yours was and early build for the particular Colmbus model. If you buy a 1st year model, expect problems.
Regarding mine, dealer tested everything and then demo everything as possible to me at delivery is what I experienced. Things like sinks, shower, toilet, furnace, water heater and AC were not actually run during my delivery demo. These major items are tested at factory, and again tested at dealer prep before delivery to customer. The 3rd test is camp close to dealer for a maiden voyage.
I towed mine about 500 miles from dealer to my seasonal park and that was it. Mine had screw fasteners in floor coming loose and a upper corner molding on bedroom slide is loose. Oh ya, the ceiling trim strips too but they fixed those with a air nailer with tiny finishing nails. I am 100% convinced that the more you tow, the more things will get messed up and need maintenance and repair. Mine is 3/12/2012 for manufacturing date and sold as a 2013 model. Like you I wanted to buy a 2012, but decided to wait till the 2nd production year model came out. We all know LOTS of bugs are fixed in the 2nd year.
Regarding electrical and disconnect switch. I have to test things and so can you but I would believe when unplugged from 30/50 amp power cord that the major electrical appliances would not work at all. If they do, they are running on an invertor which takes battery 12vdc and turns it into 120vac. They are high watt appliances and the battery would die quick as in hours not days. Again, do your own testing. Who knows, maybe the fridge/freezer can run on propane/battery. Maybe the AC and heat can run on battery instead of being plugged into 120 shore power cord. No way in heck the LCD tvs, dvd, surround sound work on 12 volts but again, maybe an invertor circuit runs these also. Again, just unplug your 30/50amp cord and start testing. I'll be doing it on Sunday.
Assuming major appliances all need 120vac to work, this would be the reason to keep your RV plugged in at all times. If you want major appliances to work, you need to be plugged in. You also need to be plugged in to keep battery charged but that goes without saying.
Minor (low wattage 120vac) devices and 12vdc items of course work on battery power. Lights, water pump, maybe the tank heater blankets - haven't tried those yet, landing legs, back stabilizer legs, awning, and slides all work from battery power.
What supprised the heck out of me is when battery disconnect is switched off, the front landing legs still worked and I believe the rear stabilzer jacks worked. Again, I need to do testing again to confirm this.
I'm willing to bet the factory is taking power for the jacks from the hot side of the switch instead of the switched side. This allows the camper to be moved in an emergency if the slam doors are locked. When locked, you can't get at the battery disconnect switch.
The proper service procedure is to disconnect wiring at battery when repairing electrical items. That way, it doesn't matter what position the disconnect switch is in.
Regarding the comment you have to keep RV plugged in all the time or you will blow out the circuit boards in appliances, power distribution panel, etc. is probably false. I totally believe the appliance will eventually shutdown if voltage is low. But to self destruct a circuit board because of low voltage is not how modern electronics are designed. They are designed to self protect from low voltage damage and reverse polarity issues. However, high voltage, power spikes/surges, lightning, static electricity, etc. is another story. That will burn out circuit boards quickly!
And yes, my background is in electrical/electronics. I'm one of the few nuts out there that actually enjoys repairing laptops. But don't ask, I retired in 2009 after 25 years of computer repair as a hobby/side business.
Sooooo, to sum it up, don't believe everything you read on the internet. Especially on forum boards like this. Believe it or not, there are clowns out there that will post false information on purpose just to mess with people. Do your own testing, fact finding, etc. Forum boards are great for gathering information. However, you have to decide for yourself if the information is true or not.