1) Looking at the swap demo video, I was wondering if the Tesla Batteries are liquid cooled? - If there is a liquid cooling (may be I am wrong), the swapping seems to be a little more complex than just unplugging a socket. - Any details regarding the cooling mechanism disconnect mechanism? - If the coolant is pressurized, there must be some kind of leak when swapping the battery. - I wonder if there is a control on the dashboard indicating the liquid level, and if it becomes too low there must be refill request warning message displayed on the screen? 2) Beside swapping why not use a "U-Haul" loaner type trailer? - I was thinking that swapping would not be the scenario that I would envisage during a trip. For example, going to a cabin or a remote Motel in the Sierra, far away from any Super Charger, I would like to use a "U-Haul" type trailer with a Tesla battery inside connected to my car. So while driving, I should be able to use the battery of the trailer instead of the internal battery. When I arrive at the cabin or the Motel, I then leave the trailer there for a full day for recharging (the cabin may have only a Level 1, 15A 110v plug) but I would still be able to drive my car for the remaining of the day, and the next day. Then on my way back, I would use first the "U-Haul" trailer and then the car battery until I find a Super Charger station. While at the Super Station charger, I would leave the loaner trailer there and plug it for the next customer. 3) Technical considerations - I think that the Roadster battery form factor would be a better choice as this battery is more compact than the flat Model S battery and would be more easier to fit inside a "U-Haul" type of trailer. - To allow using the trailer battery while driving, a cooling of the battery would be required, thus making the design of such trailer a little bit complex. - Having a trailer might limit the speed to 55 miles on High-Way, but in the case of travelling to the Sierra, this would not be too much of an issue. - There would be a need to add a secondary plug behind the car and a switch control inside the car to use the battery of the trailer instead of the internal car battery when needed. - I think that this scenario of going in the Sierra would be more appropriate when considering getting a Model X (4 wheel drive, 7 passengers) which might be heavier than the Model S, thus having a lower range. What do you thing about this "U-Haul" trailer idea?