GMC Birchaven 23' help. fresh water?
My niece just purchased a 1978 GMC Birchaven 23' and drove it from florida to my place in nebraska. The problem is she knows nothing about it. Looks like a pain to dump the tanks. My question is: ...
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I had a 1974 GMC. If I recall the fresh water tank was under the seat in the very rear passenger side. There was a valve in there to drain the tank. Of course it will depend on the floor plan.
