A tractor of a commercial vehicle comprising lateral fairings each having a fixed portion attached to a chassis, a movable portion, and a mounting arrangement to vary a fairing height of the movable portion in accordance with a fifth-wheel height of a fifth-wheel coupling, wherein the mounting arrangement is chosen between a discontinuous mounting arrangement comprising a first mounting member and a series of second mounting members, the series of second mounting members comprising separate second members aligned at different mounting heights, and a continuous mounting arrangement comprising a pinion and a rack configured to cooperate with each other to move the movable portion with respect to the fixed portion within a range of mounting heights when the pinion is driven in rotation.

A tow truck dolly fenders kit designed to enhance the functionality and safety of tow dollies, as described. The kit includes a pair of durable fenders, a front fender aligned with a rear fender, each shaped to contour over at least the top of the dolly wheels or tires for providing a protective shield against debris and hazards. A central bracket is positioned between the fenders and facilitates easy, secure attachment to the tow dolly without the need for drilling or permanent modifications. The bracket is integrated with the fenders via a connecting member and extends below thereof for straightforward mounting. The fenders are equipped with multiple reflectors to enhance visibility in low-light conditions, ensuring safe navigation. The kit is made from robust materials such as aluminum or steel and may include apertures for additional securement and an anti-corrosion coating for enhanced durability.