I made a mod of a MAN truck with a tank for a mobile farm. It can transport fuel, water, fertilizers, with a capacity of about 14 thousand liters when fully filled.
I made a TGS 18.500 4x4 Tanker model for the FS 23 farm game. There is a configuration for choosing the color of the rim and the cab separately, but you need to specify this in the code yourself. The maximum speed is 80 km/h, even when the tank is full.
The fourth screenshot shows that the MAN tank is not being filled with fuel. This refueling is not correct, but it is capable of refueling on its own.