A support frame assembly for attachment to a support mast of a transport apparatus may include a support frame with a pair of downwardly directed mounting posts. Support arms may be pivotally attached to an end of each mounting post. The support arms may each comprise a back support and an open position and a closed position. When the support arms are in the closed positioned the back supports may be substantially horizontally oriented defining a support area between the support arms, the back supports and the support frame. When the support arms are in the open position the back supports may be substantially vertically oriented and the support area is open opposite the support frame.