A vehicle suspension system includes a mounting bracket adapted to be secured to a vehicle frame, a trailing arm member pivotably coupled to the first mounting bracket, an axle member adjustable between a first pinion angle and a second pinion angle, an axle mounting assembly securing the axle member to the trailing arm member and including an upwardly disposed, curved abutment surface, and a stop member adapted to be operably coupled to a vehicle frame, the stop member including a downwardly disposed, curved abutment surface adapted to abut the abutment surface of the axle mounting assembly, thereby limiting travel of the trailing arm with respect to the vehicle frame to a constant value when the axle member is at both the first pinion angle and the second pinion angle.