The boom must not be operated if the truck is at an incline of more than what degree?

The correct answer is 5 degrees. Operating a boom truck at an incline greater than this specified angle poses significant safety risks. When the boom truck is on an incline, the center of gravity shifts, increasing the likelihood of tipping or losing stability. The design and operational guidelines for boom trucks establish a maximum incline limit to ensure the equipment remains safe and functional. Exceeding this limit compromises the structural integrity and operational stability, which could lead to accidents or equipment failure. Therefore, adhering to the 5-degree guideline is crucial for ensuring safe operation.