The only thing I see that is a bit unusual is your frequency of dumping the black tank. This is usually done only when full, as a full tank seems to evacuate solids better using the big slinky hose. The use of plenty of water, along with the natural decomposition of solids is all I need to dump our black tank every two to three weeks, and we only use a 3/4" Sewer Solution hose. Some folks use an additive to help digest the solids, cheap insurance I suppose. Detergent or TSP and some water in the tank while traveling seems to help keep it cleaner.
Regards
Gemstone
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No longer on the road.
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