Abstract: A placard or light accessory support (20) is provided for installing in and substantially concealing the opening of a hitch socket (22, 118). The support (20) includes an elongated tongue (28) having an attachment arm (34) and a mounting plate (44), as well as a sleeve (32) which can be used as needed. The support (20) can be adjusted to snugly fit into the opening of 1 1/4" (118) or a 2" (22) hitch socket by way of a sleeve (32) which receives the arm (34) for the larger hitch socket (22); when the smaller socket is employed, the arm (34) is directly telescoped therein without the use of the sleeve (32). The arm (34) is also provided with a specially configured, "FIG. 8" passageway which is oriented so as to receive a locking pin (23a, 119a) in different portions thereof, depending upon whether the support (20) is used with the larger socket (22) or smaller socket (118).