wouldn't make much since because there isnt enough weight really to "pivot" on the rear axle.... I wouldnt even think it would be a good alternative to a locker. The only way i would even consider it is if you had a selectable locker where you could unlock it and use it as a turning brake.... i dont even think a well build buggy would would have enough weight on the rear to help..... maybe in a uphill high traction situation....
im sure there are people who have done this and it may work for them... but it just dont make since to me lol