Abstract: A carriage assembly is disclosed for a garage door drive belt. The assembly includes first and second carriage elements each having inner and outer members adapted to retain an end of the drive belt therebetween. An articulated connection extends between the first and second carriage elements. Also disclosed is a support arrangement for a garage door drive unit, comprising a drive unit hanger for attachment to a garage door structure, the hanger further having a weight-supporting connection to the drive unit, wherein the drive unit position is adjustable while the weight of the drive unit is supported.