Anyone ever come across a floating carriage?

[LanSlyde]

So, lets say you have a Roc at your disposal. You can mount it easily, but you have a number of items/creatures that are simply too large for the Roc to carry around on its back. Has anyone come across the aerial equivalent of a cart? Essentially a floating platform that could be towed behind a creature. I'm thinking I could make something up involving Floating Disk, but I was curious of anyone had come across something similar already.

[Gildedragon]

Make it out of soarwood. It is naturally air-buoyant

[Vaz]

I seem to remember a picture of some Raptoran's pulling a "cart" while flying.

[dascarletm]

I think the arms and equipment guide had something on flying vessels.
Why not make it a zepplin? There is this (http://i3.photobucket.com/albums/y73/Bauglir/Face%20Sprites/FlyingTarrasque.jpg) as an example.