Do you have an idea where you will settle after you spend a while in the rv? If so, look first at domicile options in that state. If not, as mentioned FL, TX,and SD are common choices for full timers. We selected FL. By phone and by sending a form by snail mail, we established a private mailbox address in FL, then gave that new address to several businesses. The mail service aided us with info about stuff we needed (including business mail) to establish domicile there. Then when in FL, we took that Florida mail plus other needed documents to county office and DMV to get voter registration and vehicle registrations and DL. The first line of FL DL address is my RV licence plate number! Much of it can be done by mail for FL, but doing it in person went smoothly. Other states have other rules.