Steve,
21" actually seems even a little low to me. On a 30' trailer you have 15" tires so I could even imagine up to 24" from ground to the top of the ball.
Also I think you should be using a WD hitch and there are many shanks that would fit the range of heights. Call up either Reece or Equa-i-zer and they could guide you in the proper shank selection.
Mike
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07 Gulfstream Mako 28FRBH
06 Silverado 2500HD, Duramax/Allison
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