just curious on which state you would use for your drivers license because the questions I was asked when applying for my Texas DL was: Do you have any vehicles? and Are they all registered in Texas?
I know that the pdf file "Becoming a Texan" put out by Escapees says to get your license plates/registrations prior to your DL because Texas wants all of your vehicles registered here. I'm also not sure how SD would feel if you had SD license plates but a Texas DL should you ever be stopped or in an accident there.
Just food for thought,
Phil