Check your holding tanks
After owning 3 RVs this was a fist. Last trip ready for winter, had drained tanks at park rig was level came home parked on pad which is level. Always remove termination cap and open all 3 valves to a...
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Since the tank is wide and shallow the trailer needs to be leveled by the frame, not a refrigerator shelf. Also, tanks develop a belly that retains some liquid. I think that most folks would find the same results if they checked like you did. My tank flusher leaves much behind, so I add water for my trip home and dump again into my sewer connection.
