Follow-Up:
I have also been attempting to locate tires. The local continental dealer informed me that both the Contrans and Vanco-8 tires have been discontinued. Winnebago Customer Service informed me that they had gone to the 16 inch wheel in 2002 and all 15 inch tires were on back order. There were only two in stock at the factory and after they are gone there may be no more available anywhere. My tires got 29K on them before separation. The only alternative may be to go to a 16 inch wheel and a 215/75 tire.