"Mangriu batu is a stone-pulling ceremony. The stone then functions as a menhir (simbuang), a symbol that a ceremony has been performed for the deceased. Every burial ceremony, particularly those of an aristocrat, always includes the manufacture of a menhir (simbuang). The raw materials to make menhirs are usually available in the surrounding environment. The chosen stone is pulled by a large number of people from its original place to the place where the ceremony is to take place (rante). After the stone arrives at the rante, a menhir (mesimbuang) is then erected"
I've been able to find just a few videos of stone-pulling among the Toraja. This one is of poor quality, but shows a stone (maybe 3m long?) being pulled into a village and erected using ropes and poles. This video shows a smaller stone being pulled by a relatively small group of men (a second video shows another stone being moved).
Handini, Retno. 2006. Stone Chamber Burial (Leang Pa'): A Living Megalithic Tradition in Tana Toraja, South Sulawesi. In Archaeology: Indonesian Perspective, edited by Truman Simanjuntak, M. Hisyam, Bagyo Prasetyo, and Titi Surti Nastiti, pp. 549-557. Jakarta: LIPI Press.
Simanjuntak, Truman, M. Hisyam, Bagyo Prasetyo, and Titi Surti Nastiti (editors). 2006. Archaeology: Indonesian Perspective. Jakarta: LIPI Press.