I'm not familiar with your equipment but want to comment on towing basics. Listed towing capacity relates to the weight of a wheeled object where resistance is minimal, called rolling resistance. When an object is dragged, resistance is multiple times greater than the same object on wheels. (For example, envision bowling with a square ball.) It's impossible to know the towing resistance of a non-wheeled object as it would depend in large part on how much of the object actually touches the surface. However, dragging an object could be more than 10X the same object on wheels. Dragging a 100-pound tree could be like towing a 1/2-ton wheeled object.