PURPOSE:To form a space for storing the spare tires of a trailer through setting against and reduce the height of a passenger car through inclination, by pin-connecting the upper edge of a pushing-up apparatus to the outside of the rear part of a supporting plate and the lower edge to the rear part of the floor plate of a supporting frame. CONSTITUTION:As for a main deck 24, a main side plate 25 is welded onto the both sides of a flat plate 26, and a rectangular obstructing plate 28 is welded onto the upper edge of the rear part of the main side plate 25. As for a following deck 29, the front edge of a rectangular supporting plate 30 is connected with the rear edge of the flat plate 26 of the main deck 24 by using a hinge 31, and a bearing board 32 is instaelled outside the rear part of the following deck. A pushing-up apparatus 9 and the bearing board 32 of the following deck are axially installed, and the bearing board 33 installed at the rear part of a floor plate 20 is axially installed. Therefore, the space for setting against and housing the spare tires of a trailer is formed at the position surrounded by the floor plate 20, front pillar 21, following deck 29, and the pushing-up apparatus 9.
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