The Traveler is great but if this Dome is "in Motion" and the OP wants that function, why not try to salvage it! The Datron Dish on top of my MH has been their since the late 90's and it still works fine for Direct standard def TV. I bought my King Dome for a fraction of the cost of a new in motion at an RV show....the wife loves watching TV while traveling down the road.
Not everyone wants or needs HD programming so my advice is to do what you can to test it. Lots of testing info on line once you get the Model number.