How should you approach a hill while driving a combination vehicle?

Shifting to a lower gear when approaching a hill with a combination vehicle is the correct approach because it allows the driver to maintain better control and power as they ascend. Lower gears provide increased torque, which is essential for climbing steep inclines. This additional power makes it easier to manage the vehicle's weight and reduces the likelihood of stalling.

In contrast, a higher gear would reduce power and torque, leading to potential problems such as insufficient acceleration or even the engine struggling under load. Engaging the trailer brakes before ascending could create difficulties by causing the vehicle to resist moving forward. Turning off the engine is impractical and dangerous, as it would eliminate power steering and braking assistance, making it hard to control the vehicle. Therefore, shifting to a lower gear is the most effective way to navigate uphill successfully.