I never thought about somebody getting a hoof caught in the gap between the panels, but horses will do all sorts of stupid things you never thought of . . . .
Just looking around, this outfit has safety stops to put into the gap -
Oh wow - that would help stabilize the joints also, I would think.
Those look much safer than ours. Sturdy, too.
This place was off 72 on Hwy 79. It had a hiking trail separate from the horse trails and parking lots for either. It was worth the trip.