Have you looked at Xtracycle as an option? http://www.xtracycle.com/ Fits on to the end of an existing bike and extends the wheel base (see pic of bike with two kids sitting over the rear wheel on first page). Charliethebikemonger sales them on his EBay shop. http://cgi.ebay.co.uk/Xtracycle-Free-Radical-Kit-cargo-bike-surly-big-dummy_W0QQitemZ250392168492QQcmdZViewItemQQptZUK_sportsleisure_cycling_bikeparts_SR?hash=item250392168492&_trksid=p4634.c0.m14.l1262
@Smallfurry started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Have you looked at Xtracycle as an option?
http://www.xtracycle.com/
Fits on to the end of an existing bike and extends the wheel base (see pic of bike with two kids sitting over the rear wheel on first page).
Charliethebikemonger sales them on his EBay shop.
http://cgi.ebay.co.uk/Xtracycle-Free-Radical-Kit-cargo-bike-surly-big-dummy_W0QQitemZ250392168492QQcmdZViewItemQQptZUK_sportsleisure_cycling_bikeparts_SR?hash=item250392168492&_trksid=p4634.c0.m14.l1262