I've got what I consider the "hot set up". I download stuff from YouTube using a Firefox add on and save it to a harddrive in the RV. The RV is out in the garage so I added a wireless router out there (as an access point) to my home network. The RV "hits" that routers wireless so it's on my home network all the time. When I'm in the house (on the home PC) and I see something I might want to watch in the RV when camping, I save it to the RV drive over the network. Once watched, I just delete it. Also I can save movies to that drive using "DVD Shrink" software. I've got an external 1TB harddrive in the RV with a mini sized PC. The PC is only about 6x6x2 so it fits anywhere. I have an external DVD drive hooked to it and I use a wireless keyboard with built in touch mouse. Both TV's and the PC run off the inverter so the work without being plugged in. The PC has two HDMI outlets so I can use the PC in the living room or the bedroom. I ran the HDMI cable in the A/C vent to the bedroom TV. Also ran a USB extension to the center of the RV roof in the A/C vent for the keyboard dongle. That way the keyboard works all over the RV. I could add a video capture card to my home PC and do the same thing by saving the videos to the RV through the network. Works well. The only "problem" is I can only get sound out of one TV at a time. You can watch both but only one has sound. I have software to switch the sound from one HDMI outlet to the other but the sound always goes to the TV you turn on first. If both are on and you turn one off, the sound goes to the TV that is still on. Both Tv's are still hooked up to the coax so I can use the campgrounds cable TV if I want to. That's my story and I'm sticking to it.
PS: Both TV's were upgraded to 32" so they use very little power and the bedroom TV is powered using a VERY GOOD QUALITY extension cord ran through the A/C vents. All electronics are plugged into a surge and that surge is plugged into the inverter.
I have a webcam on the dash and use it as a dashcam to record driving in case of accident.
Keyboard is a Logitech K400r
Mini PC has a I3 processor so it's fast and a built in WIFI. (must have two HDMI's)
External DVD drive is in the cabinet with the PC
If you can't do the network thing, just bring the external drive home, plug it into your home PC and load it up with video's for the trip.
Low cost cables are at MONOPRICE.COM