Abstract: A tandem axle trailer frame is provided having front and rear ends and an animal enclosure is mounted on the trailer frame. The front end of the frame includes a forwardly projecting towing tongue extending forwardly of the enclosure and the enclosure includes a forward end including opposite side forwardly and oppositely outwardly facing front wall portions having animal ingress openings formed therein. First closure structures removably close the ingress openings and the enclosure includes a rearwardly facing rear wall including an animal egress opening formed therein. Second closure structure removably closes the egress opening. The first closure structures for closing the ingress openings include vertically swingable combined closure door and ramp structures swingable between upstanding closed positions closing the ingress openings and outwardly and downwardly inclined open ramp-defining positions.