What is the maximum percentage of the trailer's recommended load capacity that the combined weight of the vessel and its engine should not exceed?

When considering the maximum percentage of the trailer's recommended load capacity that the combined weight of the vessel and its engine should not exceed, the correct answer is 90%. This standard is set to ensure safe towing practices and to prevent overloading the trailer, which can lead to stability issues, increased wear on the trailer, and can compromise the safety of the towing vehicle.

Staying within 90% of the trailer's load capacity allows for additional gear and equipment that may be loaded onto the vessel or trailer, as well as accommodating any fluctuations in weight due to water, fuel, and onboard supplies. This margin is critical for providing a safe buffer that minimizes the risk of accidents or mechanical failures while on the road.

Options that exceed 90%, such as 100% or 110%, could lead to hazardous situations, including difficulty in handling the trailer during transport and increased risk of damage to the trailer itself. Therefore, adhering to the 90% guideline is essential for ensuring safe boating practices and responsible trailer management.