I choose SD as my domicile. The people at the MVA are super helpful and friendly, nothing I had ever experienced at a MVA. I’m pretty sure also if you have paid sales tax to another state for what you are registering, you would not need to pay the sales tax to register it. That is assuming that you paid at least 4% sales tax previously. There are no yearly inspections, insurance rates are low also. I say this as a full timer as I had to choose a domicile. I felt that SD was the best choice for me.
I agree with you that the laws in TX are screwed up.