We just purchased out 2014 Sightseer 33c and yes the TV set up is not easy. I have a pop up TV 1 in Living room, TV 2 is outside and TV 3 is Bedroom. If you turn on the modulator (above passenger seat) you will also see the TV antenna booster lights come on. Set them all for antenna and do your scan for channels. That seemed to work fine. Cable input works, but I think in could also use a booster or the park I was in had poor signal quality, probably the later. DVD worked for me in the TV 1 and TV 3, not done that outside.
Speakers were just as crazy. there are 10 speakers total. The TV speakers are run by the amplifier below the modulator, mine is a Samsung. You have to point the remote up there to make it work, confusing. But I did get all the surround speakers to work on the DVD and yes is was a good system. TV 1 on a TV channel only is left and right plus the subwoofer.
Now for the coach radio. There are two different speakers above the dash behind the sun screen, I had looked at the coach 3 times before I found them. So if play a radio station, two top speakers work and two of the back speaker work. Back speakers for me are above the couch mounted in the cabinet. CD in the coach radio also played same four speakers. I did plug an Ipod into the USB port and it did work well without issue.
Now if you want SIrus/XM radio to work, there is a bigger hoop to jump through. MY Pioneer unit was shipped with incorrect software. You can test this by going to Sirus/XM channel one, which is the barker/advertising channel. This is always ON, don't let the "Stealer" tell you different. IF you have no audio on channel one, it needs an upgrade. If you are computer savy, go to Pioneer web site and download the software to a USB jump drive. Turn power off to the radio, means battery off switch. Plug in the jump drive then power it back on. The radio does all the hard work, takes 5 minutes or so. Go back to channel one and you should have advertising. Now you can pay for a subscription and get music from Sirus/XM.
I know this is a lot of info, but I retired as a video systems engineer and I have to make this stuff work. Drives DW crazy, but that's my job and I do it well.
Feel free to PM with questions.