That's bullshit actually.
Most 'on skates' things, like Disney, are mostly quads.
( G/PP 💩💩💩💩💩&#128, Sun 21 Jun 2009, 19:15, archived)

Or at least, it used to be.
Starlight Express is/was all on quads.
( G/PP 💩💩💩💩💩&#128, Sun 21 Jun 2009, 19:15, archived)