Abstract: A spare tire and wheel support and holding structure for attachment to the undersurface of a conventional type trailer structure. A mounting frame for attachment to the trailer has a pair of depending plates, with the free ends of said plates being provided with apertures therethrough near the free ends thereof. A tire and wheel support fixture comprising a frame of U-shaped configuration is sized so that the open ends of said U can pass through the respective apertures at the ends of the depending plates. Quick release pins then retain said U-shaped support frame in pivotal relationship with the mounting frame, the other end of the U-shaped support fixture having hooks thereon for association with a T-bar which is adjustably mounted at the end of a rod pivotally affixed to quick release structure for mounting on another portion of the trailer structure.