Cdat,
The auditors of each state have different questions they ask to determine whether a person is domiciled there or elsewhere. In your case they might ask whether you intend to return to your home in Idaho after a couple of years of fulltiming. If the answer is yes then they might say Idaho is still your domicile because you're only renting it out temporarily. If the answer is no then they might agree this is a rental income property and you are domiciled elsewhere. People in this RV Forum have rented out their house for many years as a business and domiciled, for example, at the Escapees address in Texas. These people are fulltimers and needed a domicile that was not their old home. Where do you intend to vote? Have your driver's license? Register your vehicles? Have church membership? Have your doctors? You can own property in numerous states, but you need to settle on one of them where you do all these things to establish your domicile.
When we left California I wrote to the Registrar of Voters to tell them we were no longer residents of the state. We changed our address, driver's licenses, vehicle registrations, insurance, voter's registration, and anything else we could think of to our new state. The one exception was brokerage accounts because they can be in any state and have nothing to do with domicile, as long as you have your new domicile address listed as your address on the account. California has a hefty income tax so we wanted to make sure there would be no doubt about our non-resident status and it was a full year before we did anything that had state income tax implications. During that year we filed with the IRS as residents of our new state.
ArdraF