One of the things many of us will want to do with the MX is to tow travel or camping trailers on trips requiring stops at Superchargers. If one is in the market to get a trailer, how will we know what to get so that this will be successful? I hope we can get some community learning to share here, but what is the information we really need? I don't own a Model S, but I read lots of stuff about travelling between Superchargers. It seems that (simplified), with a given state of charge, to get to the next SC one will have to average x Wh/mi during the drive. Some conditions will allow us to drive 80 mph and achieve that usage rate. Sometimes, with a headwind or cold weather or elevation change, we may only be able to go 55 mph. I'm proposing that towing is just one more variable increasing the power use. However, since we still have a fixed(ish) distance between Superchargers and nobody want to sit at a SC waiting for a range charge, the thing that will have to change while towing is the speed. So, just to throw out some made-up numbers (nobody has real ones, so no complaints, please), lets say that we are comfortable driving our non-towing MX on the highway between Superchargers at 70 mph and charging for 30 minutes at each SC. Maybe that gives us an average Wh/mi of 350. So when we attach our trailer, we will want to still spend the amount of time charging that we already do, and the average distance is still the same between Superchargers, so we will still have to get 350 Wh/mi during our drive to get to the next one. The question is, how fast can we go, pulling this particular trailer, and get 350 Wh/mi? Obviously, all the other factors affecting range will still be there, and some of them will probably be of even more importance (like wind speed and direction), but it seems to me that if we agree on a "standard" Wh/mi rate calling for a reasonable amount of charge time, then different trailers could be tested by towing them on flat ground with no wind and simply reporting how fast that particular trailer can go (up to the 65 mph limit of trailer tires) and still achieve the required Wh/mi (350 in the example). It seems like if we can settle on some standard, then we can start to build a database of trailers showing what speed that particular model can be towed at, and we can decide if that travel speed is workable for our particular travel style. Also, with a standard Wh/mi goal in mind, owners can hook up to a trailer they are considering purchasing, tow it on the highway for a few miles and have some idea how it will work out for them. Reading ICE mpg info while towing a trailer reported on various trailer forums is totally worthless -- they all have different towing vehicles with different driving styles and they don't accurately remember their mpg or don't even know how to measure it. Yes, and sometimes they lie about the mpg they get. We will have the advantage of a fairly fixed performance on the tow vehicle (although the difference with a Performance model vs. standard in towing will probably need to be tested). Thoughts or ideas?