Abstract: A structural joint in a truck tractor frame includes a first frame member having an interface plate permanently mounted thereon, the interface plate having an interface surface contoured with a plurality of protrusions and depressions, which may be grooves and ridges. A second frame member has an interface surface contoured with a plurality of protrusions and depressions complementary to the plurality of protrusions and depressions of the interface surface of the interface plate. The second frame member is mounted to the first frame member with the interface surfaces in contact, with a plurality of releasable fasteners fastening the second frame member to the interface plate, wherein, the contoured interface surfaces interengage to resist linear and torsional shear forces.

Abstract: A structural joint in a truck tractor frame includes a first frame member having an interface plate permanently mounted thereon, the interface plate having an interface surface contoured with a plurality of protrusions and depressions, which may be grooves and ridges. A second frame member has an interface surface contoured with a plurality of protrusions and depressions complementary to the plurality of protrusions and depressions of the interface surface of the interface plate. The second frame member is mounted to the first frame member with the interface surfaces in contact, with a plurality of releasable fasteners fastening the second frame member to the interface plate, wherein, the contoured interface surfaces interengage to resist linear and torsional shear forces.

Abstract: A bracket assembly for mounting a control arm, such as a leaf spring, of a vehicle suspension. The bracket assembly includes a first, relatively more rigid member including a first mounting flange and a second, relatively more flexible member including a second mounting flange. The second member is fixed to the first member such that the first mounting flange and the second mounting flange form a fork that accepts a control arm end.