I would think if you have a WIFI lan in your Airstream then your should be able to Airplay from your Macs to an Apple TV (gen 2/3). The Airport, that generates the WIFI doesn't need to be connected to the internet to Airplay to an ATV. With a local LAN set up you don't need to rely on the peer to peer without a LAN. You will need an internet connection to stream content via iTunes, Netflix, Amazon but if you rip DVDs and store them on you Mac, iPads you should be good to go.
2008 Classic 25fb "Silver Mistress"
2015 Ram 2500 6.7L Cummins. Crew Cab, 4x4, Silver
2010 Tundra 5.7L, Double Cab, 2wd, White