Generally, the ladder-type frames of heavy duty trucks consist of sidemembers and crossmembers. When the truck is driven, these frames receive static and dynamic loads from cargo and the road surface. Torsional stresses are generated by uneven surfaces of roads. Vertical bending and torsional stresses have previously analyzed, but the crosswise bending stresses of extremely slow speed turning have seldom been investigated. For 3-axle vehicle with non-steerable rear 2-axle alignment torque about vehicle centerline is created when cornering because of non-steerable rear 2-axle resulting in side force required at the front and rear axles. This paper presents a method for analysis of crosswise bending force which represents the rigid frame stresses.