Self-strapping round bale trailer

A method of securing a plurality of bales that have been loaded onto a trailer system, the method comprising the steps of:

• loading a plurality of bales on a trailer comprising a horizontal trailer bed having a width and first and second ends spaced from each other along its length, a bale retention wall extending upwardly from the trailer bed and extending between the first and second ends of the trailer bed, and a trailer roller system comprising a first arm pivotably attached at its first end to a first structure at a first end of the trailer, a second arm pivotably attached at its first end to a second structure at a second end of the trailer, and a roller extending between and rotatably attached to a second end of the first and second arms;
• actuating the trailer roller system to move the roller in a first direction along an arcuate path extending from a position adjacent to a top surface of the bale retention wall to a position adjacent to the horizontal trailer bed.