Cargo Loading, Securement, and Weight Distribution
Cargo Loading, Securement, and Weight Distribution
This domain tests whether cargo is legal, balanced, and secured so it cannot shift or fall. The exam connects axle limits, tiedown strength, and cargo placement.
Core rules
- Keep cargo low and centered, and do not exceed the gross vehicle weight rating, axle ratings, tire ratings, or bridge formula limits. Overloading one axle reduces steering or braking control even if total weight is legal.
- The aggregate working load limit of the tiedown system must be at least half the cargo weight. Cargo longer than 5 feet but no more than 10 feet needs at least two tiedowns; add one tiedown for each additional 10 feet or fraction.
- Secure cargo so it cannot slide, bounce, or fall. Check tiedowns after the first 50 miles and after any cargo shift or change in conditions. Cargo must not block lights, plates, or the driver's view.
Worked example
A 25-foot, 3,000-pound article is loaded. The minimum tiedown count is four: two for the first 10 feet, one for the next 10 feet, and one for the remaining 5 feet. The aggregate working load limit must be at least 1,500 pounds. Reasoning: both tiedown count and strength must satisfy the rule; four weak straps would still fail.
Traps that cost marks
Counting tiedowns but ignoring their working load limit; placing heavy freight over the rear axle and exceeding an axle rating; failing to recheck securement after miles; and allowing cargo to cover lamps or plates.