A bumper for a mobile platform of a guided test platform includes a first end, a second end residing opposite the first end, a first surface extending between the first and second ends, and a second surface extending between the first and second ends and residing opposite the first surface. The bumper defines a ramp structure extending between the bumper first end and the bumper second end. The ramp structure is structured to guide a wheel of a vehicle in a direction away from the first surface as the wheel moves along the second surface in a direction from the bumper first end toward the bumper second end.