I added a second A/C to mine as well. The single 13.5K worked okay, but the second really cools the unit down quickly. Both of mine are fully ducted which gives added bonus. Say you're in the living room, turn on the bedroom A/C to keep the camper cool and it's almost silent in the living room. Visa versa for the bedroom.
The initial cost is a little high, but if your 5th is prepped, you can likely install it your self. Mine was getting warranty work done on it, and they cut me a break on the installation so I had it done! Don't be discouraged, those of us with 2 will almost always say it's money well spent and you will too!
Well, all I know is the transfer switch on my house cuts the HOT only. When I test my generator it *ties* the neutral to the power grid (a lot more than another generator I'll tell ya that) with my generator and the test is successful every time.
I don't see where this is any different, if there's no circuit's using both legs of the 50A service.
I don't have a splitter, but they do exist. They're not much money and will split the signal. I do have an HDMI switch which works quite well. The other option, although expensive is to have a splitter and wireless HDMI extender, no cables to run!
If it were me, I'd go with a 211(K/Z) which you purchase outright from dish for under $100. You can use it as a second receiver in the house. You can also attach an external hard drive which turns it into a DVR (with a one-time fee) and can have it deactivated during periods of non-use. As far as I know that's and a RG-6 cable to connect is all you need.
Just got the Tailgater myself and I too am amazed at how easy it is. One downside to us northeasters is that the dish receives the western ARC satellites which means that quite often the Tailgater will pick-up only 2 of the 3 sat's, but 110 and 119 have the majority of the channels anyway.
On a positive side, you can hook up an external hard drive (powered) to the 211 and with a one time activation fee, turn the 211 into a DVR where you can pause, rewind, skip, and record just as you would at home. Of course the 211 is a single receiver so you can't record one channel and watch another, BUT the DVR function on the road is awesome to have!