Just saw this:
I have been thinking about battery trailers for a long time as perhaps a better solution than expensive battery swap stations or scattered supercharging locations.
Why? Because we all know that 90+% of most people's daily driving can be done without any of these things, and as batteries get better this infrastructure will be used less and less until becoming obsolete (not a very good business model).
I have thought Tesla could produce their own battery trailer to take the Model S range up to 500 miles.
500 miles seems to be the holy grail for me in terms of range anxiety, as most people cannot drive for more than 500 miles in one sitting and will need to rest/sleep after that much driving, providing an opportunity to recharge overnight.
With a trailer you could plug in the car and the trailer separately, simultaneously charging both overnight and waking up to a combined 500 mile range in the morning.
Tesla could rent the trailers from their dealership locations, and offer a delivery service for those that require it.
Obviously people would only require the trailer when doing long distance trips over their car's particular range so Tesla could offer a variety of trailers with different sized battery packs but I think one trailer offering an additional 250 miles of range would be a good "catch all" trailer to make initially.
I think this service would give a lot of potential Tesla buyers a sense of security knowing that longer range trips would be possible by hiring (or buying?) the battery trailer.
What's more is that by also using a flat floor mounted battery in the trailer Tesla could create a great deal of additional storage space above the battery for luggage, sporting equipment, etc. This would be handy for those moving house or going on an extended vacation.
Only question I have for our tech minded people is how much do you think a battery pack capable of adding 250 miles range would be likely to weigh and how much would this affect the drain on the car's battery pack by pulling such a weight? Obviously at some point you would hit a tipping point of too much weight being pulled outweighing the benefits of adding additional batteries...I just wonder where that tipping point lies?
What do you guys think?