Snow-clearing trailer intended to be towed by a towing vehicle (3, 3') with a towing hitch, said snow-clearing trailer having: - a chassis extending longitudinally in a chassis direction (I-I) between a chassis anterior end and a chassis posterior end, - a snow-clearing blade borne along one side of the chassis, - at least one wheel (7a-7d) arranged so as to support the chassis on the ground, an axle of said wheel (7a-7d) being selectively orientable by orientation means between a first wheel position, in which the axis of the axle about which the wheel (7a-7d) rotates is perpendicular to the chassis direction (I-I), and at least a second wheel position, in which the axis of the axle about which the wheel (7a-7d) rotates makes with the chassis direction (I-I) an axle angle that is greater than 90°, - a drawbar extending in a drawbar direction (III-III) between first and second drawbar ends, fixed via the second drawbar end to the chassis anterior end, - at the first drawbar end, first connection means allowing a freely pivoting connection with the towing hitch of the towing vehicle about a first pivoting direction (IV-IV) substantially perpendicular to the plane defined by the chassis direction (I-I) and the axis of the axle about which said at least one wheel (7a-7d) rotates, characterized in that: - the snow-clearing trailer has length-adjusting means that are able to adjust the length of the drawbar in the drawbar direction (III-III) by means of a telescopic drawbar, with a first, tubular drawbar part slidingly receiving a second drawbar part, - the snow-clearing trailer has blocking means that make it possible to fix said length of the drawbar at a chosen length, said blocking means having: a. a plurality of radial holes (14a-14e) on at least one of the first and second drawbar parts, b. at least one radial hole on the other of the first and second drawbar parts, which is able to come into line with one of said plurality of radial holes (14a-14e), c. at least one transverse pin that is able to be received simultaneously in a radial hole of the first drawbar part and in a radial hole (14a-14e) of the second drawbar part, d. an aperture formed in the tubular wall of the first drawbar part, e. a clamping flange, secured to the first drawbar part and placed in line with said aperture, which is able to come to bear through said aperture against the second drawbar part with an adjustable radial force. - a chassis extending longitudinally in a chassis direction (I-I) between a chassis anterior end and a chassis posterior end, - a snow-clearing blade borne along one side of the chassis, - at least one wheel (7a-7d) arranged so as to support the chassis on the ground, an axle of said wheel (7a-7d) being selectively orientable by orientation means between a first wheel position, in which the axis of the axle about which the wheel (7a-7d) rotates is perpendicular to the chassis direction (I-I), and at least a second wheel position, in which the axis of the axle about which the wheel (7a-7d) rotates makes with the chassis direction (I-I) an axle angle that is greater than 90°, - a drawbar extending in a drawbar direction (III-III) between first and second drawbar ends, fixed via the second drawbar end to the chassis anterior end, - at the first drawbar end, first connection means allowing a freely pivoting connection with the towing hitch of the towing vehicle about a first pivoting direction (IV-IV) substantially perpendicular to the plane defined by the chassis direction (I-I) and the axis of the axle about which said at least one wheel (7a-7d) rotates, - the snow-clearing trailer has length-adjusting means that are able to adjust the length of the drawbar in the drawbar direction (III-III) by means of a telescopic drawbar, with a first, tubular drawbar part slidingly receiving a second drawbar part, - the snow-clearing trailer has blocking means that make it possible to fix said length of the drawbar at a chosen length, said blocking means having: a. a plurality of radial holes (14a-14e) on at least one of the first and second drawbar parts, b. at least one radial hole on the other of the first and second drawbar parts, which is able to come into line with one of said plurality of radial holes (14a-14e), c. at least one transverse pin that is able to be received simultaneously in a radial hole of the first drawbar part and in a radial hole (14a-14e) of the second drawbar part, d. an aperture formed in the tubular wall of the first drawbar part, e. a clamping flange, secured to the first drawbar part and placed in line with said aperture, which is able to come to bear through said aperture against the second drawbar part with an adjustable radial force. a. a plurality of radial holes (14a-14e) on at least one of the first and second drawbar parts, b. at least one radial hole on the other of the first and second drawbar parts, which is able to come into line with one of said plurality of radial holes (14a-14e), c. at least one transverse pin that is able to be received simultaneously in a radial hole of the first drawbar part and in a radial hole (14a-14e) of the second drawbar part, d. an aperture formed in the tubular wall of the first drawbar part, e. a clamping flange, secured to the first drawbar part and placed in line with said aperture, which is able to come to bear through said aperture against the second drawbar part with an adjustable radial force.