[i-JX]

the reason why I asked why my doesnt work is because I saw this demonstration on youtube. here is the video http://www.youtube.com/watch?v=NLgBLILhHTU. maybe the card box I test was to small.

That golf cart is a much bigger and solid object than what you've been using. Try getting someone to walk behind your JX while backing up slowly, that should do the trick as the system was build for situations like this.