A roof support system and method to stabilize the roof of a transport vehicle during repair work. The system includes a roof support assembly with a planar base, support members, a lower post, and an upper post that is slidably coupled to the lower post. A winch mounted on the lower post operates a pair of winch cables that pass through pulleys on the upper post, allowing the upper post to move upward and bring a horizontal support bar into contact with the roof.

A lifting system for a crane for generating a hoist rope pretension during a travel of a suspension element of the crane is provided. The system includes a separable pretension hook block and a connected auxiliary rope that is supported in a windable and unwindable manner on an auxiliary winch on the crane, and that is guided over a deflection apparatus arranged or installable at a boom of the crane. The pretension hook block comprises two lockable hook block parts that are releasably lockable to one another, that are connected to one another via the auxiliary rope, and of which an upper hook block part has a fastening means for fastening to the suspension element of the crane and a lower hook block part has a pick-up means for fastening a weight.

A lifting system for a crane for generating a hoist rope pretension during a travel of a suspension element of the crane is provided. The system includes a separable pretension hook block and a connected auxiliary rope that is supported in a windable and unwindable manner on an auxiliary winch on the crane, and that is guided over a deflection apparatus arranged or installable at a boom of the crane. The pretension hook block comprises two lockable hook block parts that are releasably lockable to one another, that are connected to one another via the auxiliary rope, and of which an upper hook block part has a fastening means for fastening to the suspension element of the crane and a lower hook block part has a pick-up means for fastening a weight.

A dynamic counterbalance system is provided. The dynamic counterbalance system can include a compound pulley system and an adjustment arm. The compound pulley system can include a frame, a spring, a variable radius pulley, a plurality of mounted pulleys, a plurality of moveable pulleys, and a plurality of lines. The adjustment arm can include a mountable support, a spool support, a spool, an arm inner support, a rod support, an extended rod, a rod end cap, a traveling pulley, a dynamic pulley, and a plurality of lines.

A dynamic counterbalance system is provided. The dynamic counterbalance system can include a compound pulley system and an adjustment arm. The compound pulley system can include a frame, a spring, a variable radius pulley, a plurality of mounted pulleys, a plurality of moveable pulleys, and a plurality of lines. The adjustment arm can include a mountable support, a spool support, a spool, an arm inner support, a rod support, an extended rod, a rod end cap, a traveling pulley, a dynamic pulley, and a plurality of lines.