We are getting a new horse trailer, but have a question. How long does the horse stall need to be for a 15hh QH? The trailer its self is 7feet tall, and from the end to the tongue it is 10feet long we are looking at. No dressing room just hay manger and place to put tack below it. Is this a good size? Could it fit another QH that's 15.2hh? Or is it too small? The most I would be traveling would be 1.5 hours.