I'll find out more when it's done, but in looking at the details for other cars (I picked the Nissan Leaf as a close approximate) it said 2000lbs
http://shop.tlcentral.com/store/pc/2013-2015-Nissan-Leaf-2-Stealth-Trailer-Hitch-p1120.htm
This weekend at the Issaquah WA Electric Drive event (driveelectricweek.org) there was a company that designs custom hitches for electric cars displaying their hitches on several EV cars.
They were looking for a person to donate their i3 for a week so they could use it to customize a new model...
