What is one major disadvantage of using a porta-power during vehicle rescue?

When considering the use of a porta-power during vehicle rescue operations, the major disadvantage is the extensive assembly time required. Porta-powers typically consist of several components, including a hydraulic pump, hoses, and various spreading tools. This complexity means rescuers may need time to set up and assemble the equipment before it can be put to use effectively. In high-pressure rescue scenarios, where every second counts, this delay can impede timely patient extrication or other critical rescue operations.

The other options highlight potential issues that might arise but do not align as directly with the context of extensive assembly time impacting immediate rescue efforts. Mechanical failure can occur, but with proper maintenance, this risk is minimized. Weight can be a consideration, but portable designs have made advancements to reduce this concern. Limited power output is also an important factor, but porta-powers are typically designed to deliver adequate force for most rescue situations.