If this is a dumb question or has been answered already, sorry. My Mother in law travels often to Tenn. to visit my Brother in law who is Bi-polar and has many other health issues. I would like to add another XM reciever for her car to my account. I'm sure if this will be a problem someone here will let me know. I don't think it will be but thats why I'm asking the experts. Tks in advance.---Ray