You have limited options with the Tailgater and Pathway X2. They are designed to be used only with the series 211 receivers - the Tailgater works only with a single receiver, but the Pathway X2 will work with two separate receivers using two cables, one to each of the connections on the Pathway X2. Other receivers that have dual TV capabilities require more sophisticated dishes.
You can use two TV's with one 211 series receiver, but you have to watch the same thing on both TV's.
We had a Tailgater first, but sold it to get a Pathway X2. If you can afford the extra cash, go for the Pathway X2 rather than the Tailgater. It is a little bigger and therefore harder to stow away, but it is a much more robust unit with a larger antenna inside that will pull in about a 50% stronger signal. It also will receive the southeast satellites as well as the southwest satellites, so you have more options if you are in a site with the southwest satellites blocked by trees.