Turf tread doesn't provide good traction for pulling and it's easy on the grass.
Lug tread provides superior traction for pulling, but it'll tear up the grass.
The circumference of each tire can vary when not mounted and properly inflated. Too little pressure will allow the outside edges of the tread to make most contact with the ground resulting in poor traction plus the tire will be shortened in overall height. The opposite will happen with too much pressure. With too little pressure, the hitch height will also be lowered when the tractor is pulling the sled. As tire pressure varies from one tire manufacturer to another, and depending on the width of the wheels that's being used, it seems that Carlisle tires seems to work best with about 10 p.s.i.