Can't help you with Skyhook cranes but I did run 2 - 85' ARLO cranes for about 15 years. One crane was 24 volt dc powered the other was 120 volt ac. The cranes were a workhorse, but the ac crane was twice as slow as the dc although it would lift twice as much. Most parts you needed for repairs could be purchased from Grainger. Both cranes were full power with electric brake controls, always liked the ease of operation.