Nomadic Power CEO: Tesla Thinking Of Mobile Batteries As Range Extenders, page-3

I genuinely believe there will be a market for something such as this however it may turn out to be an innovation that has popped up that is too soon.

There is dispute that the Prophet Musk said he likes the idea and also questions if he isn't doing it why would anyone.

Elon likes the idea of batteries at least carrying a 500km charge it appears because it helps people feel more comfortable with range anxiety. Having a trailer that's hire able at city limits may be a good idea however why drive when you can fly and hire.

For me there are too many variables to feel confident that this would be the right solution.