This is my Beastie, one tonne payload truck which is in process of getting a 1.9tdi Jetta engine and a quattro tranny. The two front takeoffs from the tranny will have electric motors on them and batteries will sit in a cavernous area under the rear seat. The goal is to get 2000km from a 70L tank of diesel.
The diesel engine is always producing power through the alternator which currently goes to a shunt so I will re-direct it to the batteries. I have no idea what the electrical fraction of the total mileage will be but it is fun to plan.
You are lucky to get the EV, I hear they were great trucks.