Abstract: An optical system mount including a first and second mounting block with each mounting block having attachment means for attaching a separate user supplied optical device. The attachment means associated with the respective mounting blocks each define an alignment axis. The optical system mount further includes adjustment means associated with one or both of the first and second mounting blocks to adjust the orientation of the first alignment axis with respect to the orientation of the second alignment axis. The optical system mount also includes a connection between the first mounting block and the second mounting block. Preferably the connection provides for adjustment of the distance between the first and second mounting block.

Abstract: A trailer for reducing boundary layer normal-pressure drag thereon. The trailer includes a chassis, wheel assemblies, a body, a plurality of lights, and a power source. The chassis releasably attaches to a vehicle towing the trailer. The wheel assemblies are rotatably mounted to the chassis. The body is disposed on the chassis and displays advertisements. The plurality of lights are disposed in the body and selectively illuminate the advertisements on the body. The power source is disposed in the body and powers the plurality of lights. The body is symmetrically-wedge-shaped for reducing the boundary layer normal-pressure drag thereon.