Abstract: A portable observation structure removably attachable to a wheeled vehicle comprising two pairs of upright legs in a rectangular pyramidal arrangement, said legs being removably attachable to the rear portion of said vehicle, telescopically extensible legs internally slideable in the rear pair of said legs and adapted to be extended to the ground and to provide support for said structure, and a seat member attached to the upper end of said pyramidal arrangement. This structure is useful as an observation structure for a hunter, a lifeguard, or the like.