Hello,
maybe not strictly meeting all the criteria but it is a timber cart idea, one that has never let me down except when I have to pump air back into the tires after a long period of non-use.
And in relation to bicycles I can attach the handle onto my seat post and tow stuff along behind.
Individual components can be used separately or in combination.
T handle retractable and removable.
Greetings,
Don Wagstaff