I've had the same problem with one of my horses, we ha a chiro to her and there was nothing wrong, to prevent her form tripping try and engage the hind legs more by making the horse more forward, also to help with ripping the reins out of my hands I lunged her in tight side reins ( not too tight they still need relief when in Te correct position, this is so she gets the idea that she can't just rip the reins out of people's hands for relief) for a day or two and now I half halt any time she goes to throw her head around. Hope this helps
I'd say chiro for sure, he might be stiff in his pelvis, carrot stretches also help^^
Yeah a chiro would help, he is probably has stiff hindquarters, maybe try some carrot stretches?
Yes, chiro Will probably help! You can also try to do poles in trot and canter to stimulate his back and leg muscles