Abstract: A lead vehicle is hitched to a semitrailer-type follower vehicle by a universal coupling including a pair of generally horizontal arms, rigid with the respective vehicle bodies, which terminate in interfitted knuckles with part-spherical surfaces. The outer knuckle forms a pair of prongs firmly embraced by inner wall surfaces of a surrounding split housing whose halves, meeting in a vertical plane, are interconnected by a bolt carrying a spherically convex boss supporting the inner knuckle. The vehicles ride on a track transverse to the bolt axis, two sets of wheels of the lead vehicle being mounted on a pair of wheel mountings that are swingable about that axis and have extensions forming the housing.