I am ordering the three step from horse.com
High Country™ Plastics 3-Step Mounting Blocks $79.99ea.
Make easy work of mounting, grooming, or other barn chores with one of these convenient step units.
Feature built-in carrying handles and an opening for storage. Holds in excess of 500 lbs.
Measures: 31 1/4" L x 18"W x 22 1/2"H
2 Step Mounting Block also available #BRW47