Six months before this video, this owner said her horse was hard to load on a trailer and once loaded, he would go crazy, hurting himself and damaging the trailer. He was hard to ride and would buck when cantered. She could not brush him, saddle him or clip him. He was even lunging over his stall gate to bite her. She was at the end of her rope.
I suggested removing everything from his diet except pasture, hay, mined salt and water. NOTHING ELSE! This is her video at the 6-month point.