If you have Dish - forget the pay as you go. It's far more expensive than just taking your reviever from home - which is free!
We still use the winegard Roadtrip auto seek on the roof with VP722 dual HD receiver. It has served us well for nearly 10 years. I upgraded the electronics through Winegard when the Sat 129 was launched for Dish.
If you want to fully enable both TVs separately with a dual tuner reciever, the dome type dishes are limited in that the 2nd TV can only watch channels on the satellite the primary TV has selected. If the primary TV switches satellites, the dish rotates and the channel selection changes for both TVs. I think the Tailgater has the same limitation. The Winegard Trav'ler eliminates that issue, because it locks on to all three satellites at once. Our next RV will have the Trav'ler.