Abstract: A guide device for boat trailers includes a pair of guide devices each being mounted on one of the rear frame members of the boat trailer and each guide device including a vertically oriented guide roller. Each guide device also includes an obliquely oriented roller which is positioned adjacent the associated vertical roller. The vertical rollers are vertically adjustable and each oblique roller and its associated vertical roller are laterally adjustable as a unit to permit proper spacing between the guide devices to maintain a boat in centered relation as it is pulled upon the trailer.

Abstract: A jack device for boat trailers and the like includes a bracket which is attached to the trailer frame or trailer bed. An extensible and retractable telescoping leg pivoted on the bracket and has a length greater than the radius of the trailer wheel. When the leg is swung downwardly from a transport position to a lowered position, and the trailer is then moved, the leg will be pivoted and extended to a vertical load supporting position to support the trailer so that the wheel is elevated above the ground surface. Conversely, when the leg is swung to the transport position, a spring telescopically retracts the leg in the lowered load supporting position. A foot member pivoted to the leg assures planar contact of the leg with the ground surface.