Disclosed a load measurement system includes a compartment, a damper and a weight calculation unit. A method disclosed herein allows a consumer to provide contact information to a business in response to a search request submitted to a search engine. The master and slave devices are configured to simultaneously show a same view of the document on the displays. Depth sensing pixel pairs may be formed from depth sensing pixels that have different asymmetrical angular responses. The plurality of images may represent different segments of a final rendered image, and may be combined arbitrarily in a compositing phase to generate the final rendered image. In one embodiment, a hitch unit includes a frame including first and second wall regions, the first wall region having a first through hole and the second wall region having a second through hole, and first and second units in the frame configured to extend a pin coupled to the second unit through the second through hole when an implement is coupled to the first unit and operated.