I had a trailer hitch installed in order to carry bicycles outside the car. And, of course, I've been thinking of what trailers I might pull. For a comfortable place to rest/read/nap while charging at an RV park, the "tear drop" trailers are attractive: Custom Teardrop - Teardrop Camper - Texs-Teardrop.com Little Guy Teardrop Trailers - Home To test energy consumption, I recently used the Tesla to pull a 2,000 pound capacity Harbor Freight flatbed about 105 miles and back. Trip out was empty and it came back with around 1000 pounds. I started with a full charge. Consumption was about 350 wh/m both ways. Speed out was around 60 mph, speed back was about 50 mph. Ran the air conditioning all the way. The Tesla reports having consumed 74.75 kwh but the "rated range" ended up zero. For that trip (without a trailer but with air conditioning) I would have expected consumption to be 280-300 wh/m. So, I would guess that the trailer costs 50-70 wh/m. Air conditioning seems to cost about 20 wh/m. Can anyone point me to a discussion of behavior near the end of capacity? I experienced no power cut back. Charge light on the battery bar did come on. Incidentally, I just changed a flat on the Tesla and found the easiest jack point to be the trailer hitch receiver. I lifted the whole rear of the car with no apparent ill effects. Though Tesla does not condone pulling a trailer, the hitch is rated for up to 2000 lb of trailer and 200 lb of tongue weight. Any tear drop I select will be 700-1000 lb.