Teeter-totter, Box Pedestal and Pedestal
Disclaimer : You build at your own risk. The quality is up to you to build. These are very useful props but care and preparation in small steps must be taken to use them safely. Horses stepping off these can crush you if you happen to put yourself in their path (drive them on their own path). Horses climbing onto obstacles can get wobbly with a small height never mind the height of bigger props.