Range anxiety still?
 

EP Tender range extender trailer (proposed for rental use) for those with extra long EV commutes or taking long vacation holidays. When not towed, could also be a handy home backup generator. The engineer has the backup maneuver figured out...
https://www.youtube.com/watch?v=rrM1yqVpi6M

Beautiful, but can you turn it around? :D

Why not just get the appropriate Honda or Yamaha generator and put it in the space behind the rear seat?

If they made a pickup there would be no need for a trailer.

The whole thing weighs 440 lbs.

It's supposedly 3500 watt.

A quick Google of 3500 watt gensets shows a rough sizing of 2ft x 2ft x 2ft and 120 lbs.

I'd rather set the genset on a receiver hitch mounted platform and eliminate the extra weight, cost, and complexity of that trailer.

http://i146.photobucket.com/albums/r...psxxngzyah.jpg

The backing-up solution is clever but I suspect not foolproof. I'm certain the driver can't see it AT ALL (I can't see my Harbor Fright 4x8 trailer); of course a couple safety flags would help (considered putting one or two one that trailer).

http://i146.photobucket.com/albums/r...pscbvuyaax.jpg

It would be entirely too easy to forget it's there and back it into things. Also it was demonstrated on nice level asphalt; I suspect things would not work as planned on worse surfaces.

A 3.5kw generator is not going to produce enough power to push the vehicle down the road at highway speed. It might reduce battery draw by around 30% at speed.
In stop and go, low speed traffic I bet that smaller generator might be able to keep up.

Yes, 3.5 KW is pointless. I would want one nearer to 10 KW, and diesel. Agree with eliminating the trailer and just carrying it from the hitch, although I'm not sure you could find a 10 KW diesel genset light enough.

FWIW: what voltage battery pack? 3.5 kw into a 260v pack for a 170 v maximum dc motor might actually make sense. My SOL1 controller uses the motor inductance to make huge currents on rather low battery current. Ie: motor sees about 1000 amps fron 260 battery amps at 192 battery volts & about 50% duty cycle pwm.