You can change your home if record any time you want but when you get outz they will only give you household goods move to whatever your home if record is. I know guys who bought a house in the place they intended to retire and change home of record to that.
As for insurance as.mwnriines above, if your insurance company is worth a ****, they will ask where the vehicle is primarily garaged or kept and base insurance off of that. When I first transfered to Cali, the insurance company I had specifically said they would not cover me in Cali since they were Nebraska based, and they weren't licensed for California. Not saying the insurance wouldn't be good, but the requirements for minimum coverage varies from state to state.
And on that note, if you are only paying for the. Are minimum coverage required by the states you are leaving yourself open for a lawsuit as most minimum coverage will barely cover any medical expenses if someone has to go to hospital, and if there is more than one vehicle involved, probably won't cover the total amount of damage.