Capacity for transportation of liquids
Translation from the words of the author:
This is a modified standard Joskin water barrel, which can be found in the store in the Miscellaneous section.

Capacity 7300l
It can transport diesel fuel, herbicides, liquid fertilizers, manure, water and milk.
For diesel, herbicides and liquid fertilizers, an additional warning sign will be displayed. In addition, I installed the electrical cable, which the authors have forgotten, and the choice of color for the rims and frame parts.
It can be configured in the store, the liquid for transportation and appear in accordance with the selected liquid, the symbol on the barrel. Because I find it illogical that you are driving with a barrel, for example, diesel and then milk. So you have to restore it so "clean", or you put a few barrels.
The barrel is compatible with the refueling that has recently appeared, and you can refuel it.
With water, milk, liquid fertilizers and herbicides, only transportation is possible.
Manure can be transported as well as discharged into a tank for liquid manure.

Overview
SP without errors
Multiplayer is not verified.
The only flaw that I could not fix is ​​that the beep when refueling on the trailer is still heard, when the refueling is finished, as soon as you exit the refueling trigger, it disappears.
 errors are present