The towed-scraper models-TS180 and TS220 with two rear wheels, and TS185 and TS225 with four rear wheels-feature a heavy-duty bowl design with abrasion-resistant steel used throughout, and large load capacities. The design eliminates the large draft arms (external supports) employed in most scrapers. They come standard with dry-disc brakes, with "lead" and "trailing" configurations available. Rear cylinders on the four-wheel models allow the operator to adjust the cutting-edge angle to best accommodate different soils. Caterpillar Inc. 800-368-6029.