This article is a detailed exploration of questions about residency, domicile, and all their ramifications. The first thing you will need to do in order to establish RV permanent residence in any state is acquire an address in the state.In short, you have one, and only one domicile; however, you may have many residences—in theory you could have a residence on every street, everywhere. In the state of IL, is an RV considered a primary residence if that is the only place you are living? How do you set up your domicile state as a full-time RVer? I need to establish a domicile address in Northeast suburban Illinois. The unresolved issue of where RVers are domiciled could significantly affect their tax liabilities, the effectiveness of their estate planning documents.