What additional inspection items are unique to doubles and triples?

Doubles and triples inspection adds significant items beyond a single-trailer pre-trip. Every converter dolly must be inspected for: pintle hook condition, draw bar integrity, safety chains/cables, dolly axle and tire condition, dolly brake function. Every additional trailer must be inspected like the first: tires, brakes, lights, suspension, cargo securement. All air lines and electrical cords between units must be checked for proper connection, leak-free seals, and no kinks. The fifth wheel on the dolly that supports the rear trailer must be inspected like any fifth wheel. The combination is only as safe as its weakest link.