Abstract: The boat trailer includes segmented bunk board covers, with the segments being of different lengths so that they can be combined to cover different lengths of bunk boards. The bearing surfaces of the bunk board covers include a series of oppositely sloped lifting edges that tend to lift the facing surface of the boat hull so that when the boat is tilted on the trailer, the lowermost surface of the boat hull tends to apply more weight to one of the bunk boards, so that the lower surface tends to be lifted by its bunk board.

Abstract: The trailer hitch (10) includes a guide bar (25) threaded about the stem (20) of the hitch ball (18). An alignment plate (45) that is rigidly mounted to the lower wall of the trailer tongue (34) has converging guide surfaces (50 and 51) that receive the guide bar (25), causing the guide bar and the crotch of the converging surfaces to become aligned as the guide bar engages the alignment plate. This aligns the ball receiving socket (42) of the coupler (40) with the hitch ball (18).

Abstract: An axle assembly includes a spindle (12) that extends through a mounting collar (28) into the open end of the axle. A cam key (70) moves through a key hole (22) in the axle and registers with the cam slot (54) of the spindle. The cam surface (76) of the cam key (70) is reversible with the cam surface (76) engaging either the bearing surface (58) or the bearing surface (60) of the spindle, to urge the spindle into or out of the axle.

Abstract: The disc brake caliper (26) has a stainless steel drive element (62) that faces the brake fluid and an aluminum contact element (64) received in the drive element, protruding therefrom so as to engage and move the brake pad (38) into frictional engagement with the vented rotor (40).