If you look at the TM, and understand how it works, and what you are supposed to do, then it's simple. And the cable is a 4 wire cable. Look at the schematic and it's very simple to fabricate. There is even a wire diagram in the -34 that shows what and how. The TM is your best friend.
Also, I don't think you really understand what we mean by parallel cable. A parallel cable gets hooked between gen sets to allow them to "know" where and how the phases are, and to allow the gen sets to be adjusted into phase, (synchronized). It best that you get into the TM before you try this, or you might just be looking at two gen sets that don't work anymore. The load hook up is a compleatly separate thing.