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@The Goodwins , I presume your movies are on the hard drive (what format are they, looks like some are avi?) What are you using the apple tv for? Music or games off the phone?
My tech for the van is; We have a spare Telstra Tbox (cheap as chips now), anyway I keep an eye out for family movies on tv, normally sat/sun is best. I keep it updated on a regular basis and when we go away I take it out of the family room and hook it up to the tv in the van. Only problem is you have to skip ads but the kids love watching the same movies over and over! It is only 200 gig, but that's more than plenty for a trip because I don't want them watching TV all the time.