If you are hauling horses around; be sure to take into consideration their need to. feel well-balanced and safe. Drive without relying too much on your brakes, and be as slow as necessary on curves and switching lanes so that your horse feels safe and secure.
It is not terribly uncommon for a horse to learn to resent the horse trailer and to learn to panic while being hauled if the horse is driven around with a bad driver. Sharp, jerky motions, turns, and stops, will not do your horse, your equipment, yourself, or other drivers on the road any favors, so take it easy and remember, you have a horse on board!