Unlike a finish mower, a bushhog or rotary cutter is designed for heavy brush. The mower must be allowed to pivot on the lift arms but lateral movement perpendicular to the pivot plane would not be desirable in heavy brush. This would allow the machine to move about violently and shorten the life of the cutter. The fact that most rotary cutters have one wheel instead of 4 should give pause to anyone wishing to get the cutter to float, allowing it to tip to one side or the other. This action would cause the corners of the cutter to dig in to the ground when turning.