Abstract: According to some embodiments, system comprises a metrological device operative to collect and transmit measurement data; and a hands-free communication device operative to receive the collected data and communicate the data to a user. Numerous other aspects are provided.

Abstract: Disclosed is an improved connection between the forwardly-positioned towing-vehicle and the tow-bar (for a towed-vehicle behind a rearward-mount of the towing-vehicle) such connection can for certain purposes can eliminate a "ball"-type connection in favor of a pivotal-pin-type connection; and, for the forward-tube of such tow-bar, is internally provideable with strategically-located helical-spring and manually-accessible adjusting-nut together functionable to guard the towed-vehicles' brakes from overheating during extremely downwardly-inclined roadway conditions.

Abstract: A towing hitch ball mount is adapted for telescopic use with a conventional towing hitch ball mounted receiver for automatically controlling the brakes of the towed vehicle. A pulley system having a flexible line or cable is mounted within the ball mount so that the cable is drawn into the ball mount as the towing vehicle is braked to simultaneously apply the brakes of the towed vehicle.