100% Robinia pseudoacacia
To install a post & rail fence, you need at least 3 people. One person on the mechanical shovel to operate the post driver, a second to hold the rails and a third to hold the post fitted into the rails. Each person checks the verticality of the posts and signals when the post is driven to the correct depth.
Installation of a post & rail fence in acacia. Half-round vertical posts 2.1m long and 35-40cm perimeter (14-16cm diameter sawn in 2). Horizontal rails sawn 3m long and 25-30cm perimeter.