Abstract: A compact battery-operated riding mower having a chassis with a rear end having two rear wheels, each rear wheel having a hydraulic motor attached thereto, a front end with two wheels, a cutting blade deck having one or more rotary cutting blades, and a power compartment. The mower is powered by a plurality of batteries connected in series. A first DC electric motor is positioned near the rear of the power compartment and a second DC electric motor is positioned near the front of the power compartment. The first electric motor is connected to one or more cutting blades to drive the cutting blades, and the second electric motor is connected to the hydraulic motors to drive the rear wheels. The electric motors are sealed and air-cooled.

Abstract: The anti jackknife system has locking mechanisms which automatically lock caster type wheels at the rear of a trailer in a fixed position in the direction parallel to the longitudinal centerline of the trailer and to the line of direction of travel of the tow vehicle pulling the trailer forward. In this forward configuration the tongue of the trailer freely rotates on a trailer hitch insert. In a back up configuration a locking mechanism automatically locks the trailer tongue into linear alignment with the trailer hitch insert. The caster type wheels rotate freely about a vertical axis, and when the trailer is backed up by the tow vehicle the trailer will stay in linear alignment with the tow vehicle. The caster type wheels will automatically turn in a direction corresponding to the front wheels of the tow vehicle, thereby completely preventing jackknifing of the trailer.