Not as chic for audio as at LeMans or the Nurburgring; but, pause to remember that John Wolfe's amazingly loud and lifelike wall of sound in Lima was created by those Altec clones on Gerber casters.
Sure, 10 pound monitors need cones and blu-tack and sand and....
But 150 pound horns? Naaah.
Fire up the Pignatelli and race on down to Depot or Lowe's and get Gerber ball casters with plate attachment. One style I like is a black ball in a brass housing, about $4 each.