My original Television died during the previous ownership and I negotiated the price based upon my replacing it. I bought a cheap $99 flat-screen from WalMart which was an exact replacement mounting. It uses a small charger-plug which (reading it's label) converts 110VAC to 12VDC to run the TV.
While dry-camping recently, I used an ordinary male 12V
plug inserted in the Winegard amplifier on the AS. (So, the Winegard is obviously 12V also, as it has the small cable-jumper, the green LED indicator lamp, and 12v female socket all on the same faceplate above the refer/adjacent the TV.) So, while dry-camping the TV can be run straight from the Winegard Amplifier 12V socket. (Along with a Bluetooth boosted-speaker which improves the small TV audio, and also the Blu-Ray/DVD player, all 3 being commonly hooked to the TV from which they all receive 12V power.)
We watched the hideous 3d debate and follow-ups for two hours while running the refer and furnace on the simple, flooded-cell automotive Group 24 Walmart battery on our 22' Sport. No problem.
WM and others sell 60-100 watt cigar-lighter-plug inverters for less than $20 if your TV doesn't run on 12V.
Additionally... if you want a fan... stop at any 18-wheeler truck stop and pick up a 12V table-top fan for a few bucks.
Altho' I already own a 1200 watt inverter for installation (won it for a door-prize)... I've put off installing it because I cannot figure out what I'd use it for. It won't run AC or MW or hair-dryer because it's too small... and those are the only things we'd miss while dry camping/boondocking.
BTW, just for those wondering:
An INVERTER is named so because if you look at 12VDC on an oscilloscope you'll see a single waveform ABOVE the horizontal line. So and Inverter ...INVERTS that positive waveform to a negative waveform which is also seen BELOW the line... such that it now resembles the Above/Below (alternating above/below) waveform of alternating current.
A CONVERTER (such as your Airstream already has) takes the positive/negative waveform and ...CONVERTS it to a positive/above-the-line wave only thereby mimicking Direct-Current only. (It does this after first transforming it from 110V to 12V.) Hence, the naming conventions of "inverter" and "converter".
And now, back to our regular programming....