We use our Carryout with DirecTV. Yes, you can use the primary receiver in the motorhome. We also have had Dish as well as DirecTV in the past. We found that the Dish Satellites are at a substantially lower elevation on the horizon, and (at least from our home) we lost the signal when trees filled out with leaves in the spring/summer.
Since we never used Dish on our MH, I can only imagine that the low elevation would also affect being able to get a signal while camping. The Dish network does have the advantage of being able to receive HD programming with the Carryout, while this is not possible with DirecTV. I notice the preponderance of Tailgator receivers are often set up on the ground at a distance from the camper in order to find a signal. We mounted our Carryout on a ladder mount on the Motorhome, and can usually get a decent signal since the receiver is up 11' from the ground. But if not, removing one screw allows the receiver to be removed and set up on the ground. The Ladder mount comes with a complete extra set of cables… we hardwired these cables into the coach, and have the original set that came with the receiver in case we do have to set up on the ground! Takes only a few seconds to remove.
I do recommend the Carryout over the tailgater as it allows you to use either Dish or Directv. The ladder mount for the Tailgater does not appear to be as sturdy, and indeed has to be adhered to the coach with mastic (sticky tape) to secure it properly.
We've had our Carryout ladder mount since shortly after we bought the MH in January, and it is rock solid on the ladder after 7K miles.
I have checked it a couple times since installing and did not need tightening!