Kevin,
I hope you are right about the tenders being in the yard, rather than moved to Arizona or scrapped. I don't know why someone would buy the tanks and move them to Arizona. However, that is what I was told by one person responding to my post. He said they were sold last year to some fellow in Arizona and 5-6 tenders were involved. I hope to hear from someone connected with the D&SNG who can tell us for sure whether the old tender tanks are in Durango or whether they were indeed sold and shipped to Arizona.