I have a question about SD or TX residency....do I have to spend any time in either of those states or can I just send a yearly fee to the mailbox company? And how does it work for yearly license tabs and renewing a driver's license? Also....our general plan at retirement is to live from May to September in a fifth wheel at a seasonal resort campground in MN, and then from October to April in either another RV or maybe a houseboat in a warmer climate. Due to the price of gas, and lack of a tow vehicle, we plan to stay put for a few years before hiring someone to tow us to another seasonal setup. In a case like this--we will be renting campsites seasonally--does that make us part time residents of whatever state we are in, or can we still be full time SD or TX residents? We will be living on a fairly meager pension so would like to keep taxation at a minimum and MN is a high tax state.