Art, I'll offer this advice:
I think you should contact Winnie Owner Relations
at 800-537-1885, or OR@winnebagoind.com
I see no reason why your Winnie dealer should not have replaced the battery. And as a general courtesy, they also should have put a load tester on the others to ensure they are good.
Believe me, customer service and goodwill may not always be what we think it should be, but on a brand new coach, your local dealer and Winnie corporate have to keep your satisfaction and best interests in mind.
Please keep us posted on what pans out here. Who was the local Winnie dealer anyway?