It depends in wich country you are and the voltage of the line you are interested to design, as well as if you want a complete design of the structures or only the shape and the load conditions, leaving the final calculation for the towers suppliers. You have to consider also if you wanto to...
If you have a Power Command Control system, there is no doubt that it is possible to put the Cummnis genset in parallel with other units. I have been project manager of a proyect in wich first one Cummnis unit was put into paralle with 3 other machines of different sizes and brands and 5 months...
In principle there should be no problem if the units have governors than can be programed to work in paralel mode (non isochronous). Then yuo have to adjust the "drop"of the units to share the load.
