http://www.wired.com/autopia/2010/11/range-extending-trailer-charges-your-ev-carries-your-gear/
http://www.burquip.co.za/bur/
http://www.driveout.co.za/gear/diy-build-road-trailer/
http://www.driveout.co.za/gear/dual-battery-systems/
http://www.4xforum.com/four-wheel-drive/8-trailers-towing/trailers-design/
...
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