Has anyone else had trouble getting their black tank to completely empty? It gets full and we pull the handle to dump. But after about 10 min it's only gone down to 1/3 full. The manual for the RV said to not let it get completely empty but I wanted to get others opinions. Thanks. By the way the attached picture is the setup we have for the back black tank hose to have it level so it will all push forward to the front Y attachment and dump.
2015 Forest River Heritage Glen Lite 356qbq
"The Pod" aka Place of Duty