One method is to use the boom as a gin pole, laying the mast on deck, with the boom at right angles. Hauling on the boom then raises the mast. This method has the advantage of using equipment that is already on the boat. A second method is to attach two poles called shear legs in an A-frame configuration with poles running from the sheer to meet above the boat. The mast can then be hauled upward using the forestay. This method requires additional equipment. A third method is to attach a pole to the winch post on the trailer and haul the mast upwards once again with the forestay, which also requires additional equipment. As the mast is being raised, it must be tensioned laterally. In many boats, the sidestays are not attached to the deck close to the axis of rotation of the mast and therefore tighten or loosen as the mast raises. The mast can be either held straight by a second person, or with temporary babystays mounted close to the masts axis of rotation. Engines Trailer sailers usually have a motor for docking and maneuvering. Most trailer sailers use outboard motors, which are best suited to sailboats 28 ft in length and under. Outboards offer the advantage of being light, easy to use and maintain and are also inexpensive, as they are commercially produced on a large scale and sold off-the-shelf. They can also be raised out of the water, to eliminate drag when sailing. This contrasts with inboard diesel engines which are heavy and occupy significant internal space and are best suited to larger vessels. Outboard motors used for trailer sailers need to be geared down as trailer sailers sail at slow displacement speeds compared to the higher planing speeds of powerboats, which are the most common application for outboard motors. Outboards are often mounted on the transom, with some boats mounting them in a well, also at the stern. Outboards may be mounted on a lifting mount, to allow them to be raised up out of the water. Long shaft outboard motors are advantageous, as they prevent the propeller from exiting the water and over-speeding when the boat rides over waves. Anchoring Trailer sailers usually carry anchoring equipment. Due to their small size, the tackle is also light and can be lowered and raised by hand. Therefore power winches are unnecessary. See also Day