There is a good point there. MOST domes (Tailgater is an exception) Can be programmed for different services,, There are 3 (Well 4 really but domes can not do the 4th and some can not do the 3rd either)
Dish: Western Arc (Far as I know they all do at least one bird at a time on the western arc, more on that later)
DirecTV (NOT HD)
Dish Eastern Arc
DirecHDTV (not compatible with domes)
Dish both HD and SD are dome compatible. BUT some domes will switch satellites under receiver control and some do not, some can do the HD bird, and some can not without a software upgrade.
The Tailgater is specific to Dish Western Arc, IS controlled (And powered) by a 211 Receiver and Does do HD. But you have an older dome.
Call King, ask them,, You may need to do things.
Go to the King Controls web site, See if you can Download the owner's manual.
Suggestion: All the "Goodies" in the RV,, Do likewise, download the owner's manuals.. My Owner's manual pack is rather heavy,, This computer which has nearly all of them on it's HD is much lighter and better organized as well.