Caution do not try this at home. Now that I have that out of the way I believe I can successfully tow with my Model 3. I just took a test drive of 40 miles and all checked out. As I feared the watts/mile shot up from 230 to 400 so expect about 170 miles of range towing something substantial like my 2000lb (loaded) A-Liner. First I installed the hitch 2018 Tesla Model 3 Stealth EcoHitch which took me about 4 hours. 2 ½ hours of which was scurrying for bolts. That issue I have been told has been resolved. The hitch is quite solid and I really like how it attaches. I towed this A-liner over 13,000 miles with my Volt and the rear of the Model 3 is much more substantial which is good as I did have to beef up the Volt during one trip. For the 4 wire harness I use the no cut inductive harness from eTrailer. https://www.etrailer.com/Custom-Fit-Vehicle-Wiring/Tesla/Model+3/2018/119250KIT.html?vehicleid=201870784#exp-productdetails=.all-description While pricy it works and the only challenge was running the power wire from the battery to the module which in reality was not too bad. I installed the kit in about 2 hours. I then added a 7 pin connector from eTrailer Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires e and could have likely saved money as I only really used the plug and bracket. I made an additional bracket out of 1/8” Al (3” x 5.5”) that attaches to the bolt on the hitch so if I want to take off the hitch the wiring harness also comes off. Not sure I needed a brake controller but I added one. The wires for the brake seemed like a bear to get to and I hated cutting into the wires as the braking is not straight forward on the 3. Fortunately Tekonsha makes a highly rated controller that is wireless and detects braking from an inboard accelerometer. Tekonsha Prodigy RF Wireless Trailer Brake Controller - 1 to 3 Axles - Proportional Tekonsha Brake C While pricey it seems to work well and it was a snap to install.