This week my family took a vacation to Donner Lake in the North Lake Tahoe Area. We took our Model X and towed a pair of jet skis on a double trailer. I was very nervous about the climb up the hill and can report that the X did great. We have a P90D and the available towing power is amazing. When passing, one could easily forget that you have anything behind you. We live in Cupertino and made it to Rocklin supercharger on one charge from home. I set the cruise control to 55 initially and cheated some to 60 mph when my wife protested that the drive was taking FOREVER. We charged in Rocklin and headed up the hill to Donner pass. At the peak this is about a 7300 foot elevation change. We arrived at the Truckee supercharger with 75 miles to spare. Our trailer is about 2000 lbs with both skis and gear. We are a family of two adults and three kids, two cats, and a fully loaded car for a week vacation. I expected to run out of juice before the summit... I was pleasantly surprised. With the trailer and loaded car, we averaged about 550 wh/mile on flat land and 750 wh/mile on the climb up the hill. Hope this helps others making a similar journey. We also have made the trip carrying bikes and skis with a yakima full tilt hitch and ski adapter and was pleased with the performance of this accessory. It is the same as the Tesla branded version on the website, and I am very happy with how it worked. I'm not sure how the trip would go with a 5000 lb boat in tow, but with our two jet skis, it was a breeze.