Hi all.
You can sell it hvere you want. just ad liquidmanure to one of your sellpoints, or make a new sellpoint if you want. Dont forget to ad a pricemultiplyer as well.
Then find some kind of pipe or the thing with hose in the picture,
I got the hosething from: Bauertraump map V1 reloaded. extract the hosething from BGA2.i3d
located in a folder named siloswaage.

and put a trigger like the ones in the farmsilos at the end of that.
I dublicated the rapetrigger,and Changed the triggers userattributes from
rape to liquidmanure.
And i added liquidmanure to one of my trailers.
Works great for me.