An offset tow arm apparatus for towing an implement supported by at least one wheel having a rotational axis perpendicular to the operating travel direction comprises a tow arm having an inner end and an outer end. A pivot arm has a rear end pivotally attached to an inner portion of the tow arm and a front end adapted for pivotal attachment to a towing vehicle hitch. A lock is operative to lock the pivot arm in a fixed position with respect to the tow arm. An outer castor wheel is pivotally attached to the apparatus to support the outer end of the lateral, and an inner castor wheel is pivotally attached to support the inner end of the tow arm. An implement hitch is attached to an outer portion of the tow arm between the outer and inner castor wheels and is adapted for attachment of an implement to be towed behind the tow arm. The apparatus is adapted to prevent lateral movement of the implement with respect to the tow arm.