Question about the Brown Pyramid of death

[Biggyniner]

Hi All,

Since I'm new to all of this I was hoping to get some advice regarding full hookup sites.

I was always under the impression that if I had full hookups I could just leave my valves open. After reading about how the liquids will run off and the solids will remain behind I realize that, that is a bad idea.

So my question is what is the point of full hookups? Most of the State Parks here in Oregon say to not dump a full tank at the site sewer connection but instead at the dump station. What do you all do?

[wilpower]

Grey tank open, black tank only when full.