Your residence is the place you are living at the present time. For an RVer, this can change frequently throughout the year. It is quite possible to be a resident of a place without being domiciled there. There is no law that says where your domicile has to be. There are however, state laws that define residents of a state for various purposes including taxation and voting.
Every person has only one domicile at any given time.
An old domicile continues until a new domicile is established. A person acquires a new domicile by actually establishing a dwelling place in the new state with the intention to remain there. The physical presence and intention must normally occur simultaneously. Because the ultimate question is one of intent you must be able to point to specific objective factors that demonstrate your intent to make a place your permanent legal residence. Location of the remainder of the immediate family.