These images come to us courtesy of Sigrid Frings-Watterott from Hasenkamp.
This crate moving fixture is adjustable and has been useful on multiple occasions when dealing with oversized crates. It is constructed out of aluminum structural framing designed to be fastened together in all sorts of ways. There are all kinds of components that can be assembled in different ways to make different things. With and impressive strength to weight ratio it is kind the ultimate grown up erector set (Don't you dare ask me what an erector set is).
In the States I have used a version called MiniTec
Yeah, I'd like to see someone do something along that line (smaller though - as you point out a smaller structure with a shorter wheelbase will make turns better) out of something like unistrut. Commonly available and reasonably affordable. The aluminum is beautiful stuff but priiiiiiiiiiicey! Kind of out of the reach of all but the most flush organizations/companies.