4 twin cab utes per family?   I have never seen this.  Most families have two cars.  the "big" car that is drive by whoever does the least miles and the small efficient car.  Who owns four twin cab utes?  I've never heard of such a thing.  
You still don't get it, the ev can NEVER replace a twin cab ute.  as soon as you try to tow or carry anything they are just a laughing stock.  I guess there is that electric car in new zealand that managed to to a little boat to the local boat ramp and back (we will ignore the fact it burst into flames and burnt the house down when it got home).
https://www.youtube.com/watch?v=qBHFHKmRwuA
like i said, I have nothing against electric cars, but we need to be sensible.  they can and only will work for the small minority (local driving, offstreet parking, etc).