This is coming out Fall 2012 from Xtracycle and I gotta say it looks intriguing. With a capacity of 200lbs- it also folds up and out of the way (to get into doorways and the like.) It will retail for $149- though if you want a platform for it- that’ll cost you extra.
If you are carrying something like a keg or boxes or something like that- keeping the load lower on this platform seems like a good idea. I can’t speak to stability while turning, but they’ve hopefully figured all that out.
If you already have an Xtracycle- this looks like it could be a worthy investment. Any Xtracyclers out there have thoughts on it?
Pre-order yours HERE