A system includes: a detection means that detecting the weight of the load that is being manipulated is integrated into a load-sensitive guide pin that forms part of the axle bearing and that can output a signal that is proportional to the effect that is caused by the load, a power source to provide driving power for the load-sensitive guide pin, a sensor cable for the transfer of a driving voltage from the power source to the load-sensitive guide pin, a calculation means that is in signal-transfer connection with the load-sensitive guide pin in order to calculate the weight of the load that corresponds to the signal from the load-sensitive guide pin.

A boom truck having a grapple bucket with first and second jaws which controllably pivot on an axle from an open to partly closed jaw positions. The bucket picks up a debris-carrying bag via lifting straps. The bucket has an elongated hanger, one end mounted on the first jaw and an opposing strap carrying, terminal end which transverses the axle in open jaw position. Bucket a wiper mounted on bucket's second jaw with a wiper surface adjacent hanger's strap carrying region in open position. Hanger's terminal end region is foreshortened such that the end arcuately bypasses wiper's surface during pivotal movement of both jaws during transition from open to partly closed jaw positions. method of lifting, carrying and depositing a debris-carrying bag having at least one lifting strap. Method includes placing lifting strap on strap carrying region and lifting the bag in the open jaw position. With grapple in final deposition position, jaws pivot from open position to partly closed jaw position and strap is pushed off the strap carrying region by a wiper mounted on the second jaw. Creating gap between strap carrying region and wiper off-loads strap via gap in the closed, bag deposition position.

A boom truck having a grapple bucket with first and second jaws which controllably pivot on an axle from an open to partly closed jaw positions. The bucket picks up a debris-carrying bag via lifting straps. The bucket has an elongated hanger, one end mounted on the first jaw and an opposing strap carrying, terminal end which transverses the axle in open jaw position. Bucket a wiper mounted on bucket's second jaw with a wiper surface adjacent hanger's strap carrying region in open position. Hanger's terminal end region is foreshortened such that the end arcuately bypasses wiper's surface during pivotal movement of both jaws during transition from open to partly closed jaw positions. method of lifting, carrying and depositing a debris-carrying bag having at least one lifting strap. Method includes placing lifting strap on strap carrying region and lifting the bag in the open jaw position. With grapple in final deposition position, jaws pivot from open position to partly closed jaw position and strap is pushed off the strap carrying region by a wiper mounted on the second jaw. Creating gap between strap carrying region and wiper off-loads strap via gap in the closed, bag deposition position.