I read it, but I'm not sure I followed the formulas. In any case, my 1-ton Diesel dually would drop from 17 mpg to 12 mpg when towing a small, light, but very boxy enclosed trailer. Our Tesla Model X Wh/mile increased from 345 Wh/mi to around 700 Wh/mi pulling the same trailer.
Diesel shows a...
Figure 60% range reduction, 200 miles vs 500 for the tri-motor, or 100 miles vs 250 for the single motor. EVs seem to take a much larger range hit than ICE when towing. I'm not sure why, but every instance I've seen and experienced shows this to be true.
Use a single account to order both, otherwise you'll have to constantly log out and in via your phone app to manage the separate vehicles. With both on the same account you simply swipe left or right to change between vehicles (or powerwall).