My questions are:
I use a satellite dish for the Dish network and can never get the wiring to work for it I have to run the cable through the window and into the dish box to get it to work.
What if anything am I doing wrong?
The cable from the outside runs to the inside jack with the power amplified button on it. You have a couple of choices to get this to work both of them will require modifications to how that jack is wired. Jayco's have an A/B plate which you can add as well. If you're interested in doing this, I can elaborate more but the modification will look something like this:
How can I get this to work if I put in a second TV in our bedroom? Do I need another Dish box?
If you want to view a separate channel, yes. If you want to view the same channel AND have an RF output on your satellite receiver, the modification I alluded to above can help distribute the signal to the remainder of the RV
Now if the campground has cable I hook up from campground post to the side of my RV and I can get a signal inside the RV.
Under this connection would the 2nd TV in our bedroom work without any issues?
Not sure I understand this question, but using the above idea, you can use cable OR satellite. To use both the satellite must have a separate cable run.
Since it is a single receiver box you can't watch one program and simultaneously record another for the same time slot.
You can watch one program and record another if you are watching a recording OR you have the over the air module and are watching an OTA channel.
But you are correct, you can not watch one LIVE Satellite show while recording a separate Satellite channel.
You can get an external wifi such as the BearExtender mentioned above. It basically replaces your internal wifi with an external unit whose antenna is far more sensitive than the one built in. I use one on my MacBook when traveling which will usually result in far better connectivity.
If you have a bunch of devices which all require internet, then maybe a wireless bridge type solution is best for you?
If you stay for a month or so at a time at a site, I would agree with the standard residential type dish. They will get a better signal simply because they are larger dishes. I personally went with the Tailgater. My trips consist usually of one long one (10 days or so) and a number of 2-3 day trips. The tailgater being an automatic dish is fast and easy to set-up and was the least expensive choice for me.
Drawback of the Tailgater (I knew this going in). It uses the western arc set of satellites. So being in the north east, it's not uncommon to not receive the 3rd satellite (the HD satellite), but the other 2 come in just fine. Other disadvantage of the Tailgater is it can have only ONE single tuner receiver (which again is fine with me).
Advantage of the tailgater is price. It's the lesser expensive option which is great for the weekend type of camping that we do.
If I were full time, I would likely get a hybrid solution. If I moved around a lot, I would get a permanent mount for the roof (again automatic) AND a Tailgater (or other portable). If I were more settled in one place, certainly a standard dish which will take far more time to setup, and is far more involved, but will yield better results.
Finally, if you're in the north east, and HD is important it's best to look beyond the Tailgater otherwise I love mine!