We keep getting conflicting answers to questions from Dish. We asked to speak to a technical rep, but was told by the person we were talking to in customer service that they could answer these questions. Would really appreciate some definite answers as to what we would have to do or acquire to choose one of these options: 1.If we install a duo hd-dvr receiver (612), what would we need to hook it up to our RV that only has one cable? Running additional cables is not an option. We were told by Dish customer service that we could use the 18" round dish with 2 inputs that we have been using with Directv for standard viewing with this receiver. 2.If we opted to install a single hd-dvr at home along with a standard dvr (512) receiver to travel with, what would we need to hook it to RV that has one cable and also again, the question about the dish. 3. If we opted to install a single hd-dvr (612) at home along with just a standard receiver, what would we need to hook the standard receiver to the RV using only one cable. Would the 18" round dish work as we were told? If we can get some definite answers to these questions, we are going to change to Dish. Thanks.