We used these to load straight trucks years ago. The trucks held 200 to 300 hundred bails of hay or straw. I believe the one we had was made by Henry. The picture shown is in the transport position. It lays down on the 2 upright bars for use. In that position its has a bracket that mounts to the truck or trailer. 1 driver and 1 or 2 people on the truck can easily load it. They worked very well and did save in labor. Sometimes a person would walk the field first to ensure the bails were straight and also combine 2 or 3 rows depending on the number of bails.