Almost none of that is true unless things have changed since July. As I said, the ONE thing I don't know about is anything kei specific. Pennington County redid their website, and no longer has the out of state registration page on the treasurer's site that I was going to link, so perhaps something did change. Spend 15 minutes on the phone and check with them. I can also personally assure you that they have a very straightforward procedure for changing title to a motorhome. It's not okay in the eyes of NY (nor most any other state) since when you live here, vehicles you own must be registered here. SD doesn't care the address of the registrant. And they have no inspections.