Abstract: A multiple use farm trailer for transporting large round hay bales in one configuration and rectangular hay bales or farm machines in another; the trailer includes a multiple-section deck with a stationary center section, two inner deck sections which pivot upward about a longitudinal axis, a locking leg of each inner deck section for retaining the inner deck section elevated at an angle to the plane of the deck, attached to each side of the deck is a side wall pivotally mounted to the deck whereby the elevated inner deck sections and their adjacent side walls in their raised positions form a cradle for support of a row of round hay bales. The pivoting side walls include linear actuating means for lowering the side walls and rolling the hay bales off the trailer.