Abstract: A device for a aligning a trailer hitch ball with a trailer coupling includes an elongated guide strip that is positioned on the ground with a portion immediately beneath the ball on the towing vehicle and a second portion immediately beneath the trailer coupling. A first target is mounted on the trailer hitch ball while a second target is mounted on the trailer coupling. A convex mirror assembly is mounted on the rear of the towing vehicle using any one of a plurality of adjustable mounting brackets. The mirror is positioned such that the towing vehicle driver can see the trailer hitch ball and the target mounted thereon. The towing vehicle driver reverses the vehicle while guiding the first target along the alignment strip. When the driver observes that the first and second targets are aligned, the coupling is properly aligned with the trailer hitch ball.

Abstract: A reinforced concrete threaded pile provides a generally conically shaped tapered concrete pile member which is provided with a metallic reinforcement core for carrying the torsional and tensile forces created in the pile during its insertion. A metallic head is provided at, for example, the upper portion of the pile, which provides a point for the connection of a sufficient torsional driving force thereto for insertion of the pile. The head member can be metallic, and is substantially integrally connected to the reinforcement core, so that the torsional forces can be developed through the head and the reinforcement core such that torsional and tensile forces are not carried by the concrete to a degree which would cause a failure of the concrete by cracking. The concrete body is provided with an outer surface of spiral threads which has a relatively minor thread pitch that provides for relatively easy insertion of the pile into the desired soil medium and is mechanically compatible therewith.