Q:1. Can my home and RV be on the same bill? Should I just order the service with extra receivers (I will have my own antennae), then take one receiver with me when we are on the road?
YES, however.. If it is a HOME account then it does NOT qualify for distant network service in most cases (Yes there are exceptions).. If it is an RV account it does.. no reason to have a home account since you can use your extra RV receivers in the house as easily as the other way around.
As for Sundy Ticket.. Not an interest of mine but odds are you can order via the World Wide Wait,, er, Internet.