The “Wish I Knew” post was such a success, I thought I would post another four items resulting from RV repair service calls where the owner said, “Oops, I wish I knew that beforehand!” The dreaded poop pyramid.Yes, I said it, and most all of us have had it…the black tank seems full, but doesn’t drain. Most of the time that happens, there is a pile or pyramid of “stuff” in the black tank just below the toilet drain and it just sits there, not going down the sewer hose. To get rid of that pile, you need to use this flexible spray wand  that goes on the end of…