Thanks for all the info provided. Black tank issues have been resolved (finally did get the tank completely empty) and things have been great with the camper for the last half dozen trips.
Did do an upgrade recently, found a new TV that just begged to come home with us -- who were we to say no......
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2008 Keystone Cougar 278RKS
2004 Silverado CCLB, 6.6L LLY Duramax
Located just outside Glacier National Park, Northwest Montana.