I am not too sure I would want to plunk that much weight into a folder, by my best guess it would add a good 3#+ to a standard 24# folder, pushing the weight up to unmanageable for all but the strongest people. I can jack a 60# bike around with no problems, but when it comes to folders I want to keep it as light as reasonably possible to make handling easier. But it is a neat device and I can see a market for it. I may give one a shot on my Staiger when I convert to the Xtracycle/StokeMonkey configuration next year.
Aaron