vertical trucks

[MITCH KIEL]

      A local college has recently purchased a nearly-new high-quality American
vertical piano, which comes stock with 4 heavy duty brass casters. The piano
will be used mostly for performance. The Music Building has a brick floor(!!)
and standard metal threshholds at doorways. It's conceivable the piano might
even need to be rolled/transported to another building. The piano is *very*
heavy for a 44" vertical. Also, appearance matters.
      What sort of truck/dolly/casters might y'all recommend?

      Mitch Kiel