Wheel axle suspension of a vehicle, comprising: - an axle body having a rectangular, preferably substantially square, cross section, having a front side, a rear side, an upper side and an underside, and having an upper front corner, an upper rear corner, a lower front corner and a lower rear corner, - a flexible trailing arm extending in a longitudinal direction of the vehicle and crossing the axle body substantially perpendicular, the trailing arm having a front spring portion extending in the longitudinal direction of the vehicle and provided with an eyelet formed at a front end, and a generally L-shaped axle seating portion adjoining the front spring portion at a rear end of the front spring portion, wherein the generally L-shaped axle seating portion comprises a longitudinal portion extending substantially in line with the front spring portion, and a downwardly extending portion adjoining the longitudinal portion at a rear end thereof, wherein the downwardly extending portion extends substantially perpendicular to the longitudinal portion, and wherein the axle body is received in the generally L-shaped axle seating portion with the upper side and rear side of the axle body facing the longitudinal portion and the downwardly extending portion respectively, - at least one clamping strap assembly (17, 20, 22) for clamping the axle body and the trailing arm together, characterized in that, the axle seating portion of the trailing arm has an axle body facing surface having three engagement areas (29c, 29d, 29e) engaging the axle body respectively at the front upper corner, the rear upper corner and at a region at or adjacent the lower rear corner of the axle body, wherein in an untensioned state of the clamping straps between at least two of said engagement areas (29c, 29d, 29e) there is clearance between the axle body facing surface of the axle seating portion and the upper side and rear side of the axle body. - an axle body having a rectangular, preferably substantially square, cross section, having a front side, a rear side, an upper side and an underside, and having an upper front corner, an upper rear corner, a lower front corner and a lower rear corner, - a flexible trailing arm extending in a longitudinal direction of the vehicle and crossing the axle body substantially perpendicular, the trailing arm having a front spring portion extending in the longitudinal direction of the vehicle and provided with an eyelet formed at a front end, and a generally L-shaped axle seating portion adjoining the front spring portion at a rear end of the front spring portion, wherein the generally L-shaped axle seating portion comprises a longitudinal portion extending substantially in line with the front spring portion, and a downwardly extending portion adjoining the longitudinal portion at a rear end thereof, wherein the downwardly extending portion extends substantially perpendicular to the longitudinal portion, and wherein the axle body is received in the generally L-shaped axle seating portion with the upper side and rear side of the axle body facing the longitudinal portion and the downwardly extending portion respectively, - at least one clamping strap assembly (17, 20, 22) for clamping the axle body and the trailing arm together,