I've got a Model 3 (LR AWD) on order, complete with tow bar. I fly gliders had need the bar for towing the trailer. A typical gilder trailer, with glider inside, is about 500-600kg. They are pretty long (typically about 8m), but have a much lower and smaller profile than a caravan so they have much better aerodynamics. So, the question is, how much will range likely be affected? On my current BMW 335i, the trailer adds about a 20% hit. I'm hoping this will be similar on the M3. Has anyone any experience of towing with theirs?