she is 18hh, the wheels are 51" it is a full draft cart and should fit her well. ADS has the chart, I scoured that thing before starting cart shopping. She doesn't panic about the shafts hitting her, they didn't even bother her, she just tries to turn on her haunches, rather than walking a full circle, though it may have been because I was at her shoulder, as she does walk the circle when we do ground driving, rather than turning on the haunches.
Would the suspended training shafts help her at all, or really, since she's not bothered by the contact of them, does she just need to go on to the cart and figure it out? I'm just trying to protect the cart as much as possible.