I'm looking for a trailer (need it for possible future hurricane evacuation). My horse is an approx 16-3 Perch/TB cross, more draft than TB, I would guess 16-1800 lbs. He is a nice and calm trail horse, used to being around lots of commotion (trains, boats, dogs, etc). Would a 7' tall trailer be sufficient, or would a 7'6" be necessary? Please include experiences if available.