...pull them together? Long shot, but worth it if it works out 
SO basically I am looking for a little gadget that lets you string two or more wheeled suitcases together (the upright, more modern kind, not the horizontal kind), in such a way that you can then use the extended handle on the first one to pull the whole lot behind you. The idea is you arrange them with the biggest one closest to you, then in decreasing order of sizes behind that, with the back of each new suitcase touching the front of the previous one; each bag rolls on its own wheels, the extra bags don't use the wheels of the first. The general effect when the Whole Thing is on the move is rather like a mother duck being followed by its ducklings.
They are sold for people going on a trip that is too long for one suitcase, even if it is big, because obviously it would be a huge hassle or even impossible to tug two roller cases at the same time - let alone any more than that.
I saw this little gadget in a luggage catalog a few years ago, but at the time I didn't anticipate ever needing it so stupidly enough I didn't think to clip out the entry so I'd have at least the name for the thing
Except now I am planning a long trip, and am thinking I will probably end up needing two cases *d'oh!* I tried all the search term combinations I could think of, but I'm not getting anywhere so I thought I'd try here - especially since even though I've tried a lot I still have the feeling I'm missing one good keyword for these, but now my mind is stuck :-(

SO basically I am looking for a little gadget that lets you string two or more wheeled suitcases together (the upright, more modern kind, not the horizontal kind), in such a way that you can then use the extended handle on the first one to pull the whole lot behind you. The idea is you arrange them with the biggest one closest to you, then in decreasing order of sizes behind that, with the back of each new suitcase touching the front of the previous one; each bag rolls on its own wheels, the extra bags don't use the wheels of the first. The general effect when the Whole Thing is on the move is rather like a mother duck being followed by its ducklings.
They are sold for people going on a trip that is too long for one suitcase, even if it is big, because obviously it would be a huge hassle or even impossible to tug two roller cases at the same time - let alone any more than that.
I saw this little gadget in a luggage catalog a few years ago, but at the time I didn't anticipate ever needing it so stupidly enough I didn't think to clip out the entry so I'd have at least the name for the thing
