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The disclosure is of a boat trailer, comprised of a wheeled chassis, adapted to receive and vertically support a boat. The improvement comprises two longitudinal, parallel rails mounted on opposite sides of the chassis, to guide the boat into a centered position. These rails are long enough to preve

The disclosure is of a boat trailer, comprised of a wheeled chassis, adapted to receive and vertically support a boat. The improvement comprises two longitudinal, parallel rails mounted on opposite sides of the chassis, to guide the boat into a centered position. These rails are long enough to prevent the boat from cocking into a crosswise position on the chassis under adverse conditions of wind or waves, and also guide the boat when inaccurately steered in going onto the trailer. These rails are in the upper end portions of upwardly reaching leaf spring arms, mounted at their lowers ends on the chassis. The spring arms deflect under impact by the boat when inaccurately steered between the guide rails, and may react to bounce or throw the boat toward longitudinally aligned position. Preferably, convergent wings are used to guide the boat into the space between the longitudinal rails.

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