A carriage assembly is provided, which is adapted to be movably coupled to a mast assembly of a materials handling vehicle. The carriage assembly comprises a lifting carriage comprising a lifting carriage upper member including structure for laterally shifting a fork carriage. The fork carriage is mounted on the lifting carriage upper member and comprises fork carriage upper and lower members and fork carriage first and second side members, wherein the upper and lower members are coupled to the fork carriage first and second side members. The upper member comprises a fork-supporting bar having an outer fork-receiving hook and a reinforcement bar mounted to a first side of the fork-supporting bar opposite a second side near the fork-receiving hook.