Folding bike trailers

Time and again I have been in situations were a bike trailer would be useful for carrying luggage -
but I have been put off by the fact that trailers go a long way towards destroying the portability
of a bike - for instance, if you use the trailer to get bags to the station, you then can't get the
bike + trailer on the train.

I was thinking of trying to put together a lightweigh, folding trailer that could be stowed on
the pannier rack when not needed - while this would be a bit heavy and bulky, I think it should
be possible.

Does anyone here have any design suggestions, or know of any similar products already available?

Thanks

Ben

 

Oops .... Sorry 'bout the double post. Google groups took so long to update, I thought the first one
hadn't gone through ...