The RV dealership tried to get an answer from Crossroads but he was sent to the distributer and then to a supplier for information on this discontinued wheel. (why discontinued??)
The manager from the local tire shop came to our residence with a real Breadth Caliper and confirmed some of my readings. Now that is good SERVICE! Obviously my wooden caliper was never calibrated to NIST Standards.
The Etrailer aluminum wheel that I ordered is close enough for the ST235/80R16 tires. The wheel measures 6.5 inches while the new wheel will be 7 inches wide.
Tomorrow it will arrive with free shipping and hopefully no cracks.
I may need a new center cap.