Those are only used with the rocking bolster. I would take the rocking bolster off. They where a terrible idea that may have worked on perfectly flat ground but just made for upset wagons every where else.
If you do not want to loose the height the rocking bolster gives you then just make some steel stops and weld them in to make it solid. I would not dare have a wagon with a walking bolster on it and haul people on it. If they all would get to one side it would tip over.