I'm taking care of my friends horses while they are on vacation and the 3 month old colt injured himself badly last night. Our vet wants him at the clinic when it opens in the am. I have hauled my horses all over but no experience hauling this young of horses still on the mare. I'm going to use my bumper pull stock trailer since the step up is lowest option. It has a middle gate that divides it in half. Do I tie the mare in the front and leave the colt loose in the same partition(there would be room) or what do I do? Thanks.