Speaker placement tool??

I've seen on a web site (too bad I can't remember where) a special trolley made possibly for Watt/Puppy's where you place the speaker on top of it, raise it a little so the speaker is elevated off its feet and speaker and trolley can be moved around on trolleys small wheels. Once the perfect placement is achieved you lower the trolley and take it away from underneath the speaker.

Did you see something like that? If so where was it?