If you can, help yourself by jacking up one wheel at a time and then spin it with something such as a small grinding stone or a wire brush wheel in the chuck of a drill motor applied to the tire tread. A helper could run the drill motor for you. Then compare the passing tire tread with the ground or pavement underneath. This might help you to lead the experts to the source of the problem. At the least, it would tell you what is not the cause of the problem.