Combination Vehicle Inspection and Basic Control Skills
What the test expects
A combination vehicle inspection is a systematic walk-around, not a glance. Start with a pre-trip routine you can recite: approach the rig, check the coupling area, then work front to back and left to right so nothing is skipped. Know the parts unique to a combination unit: the fifth wheel and its jaws, the kingpin, the locking lever and safety latch, the air/electric lines (often called the glad hands and pigtail), the trailer frame and landing gear, the sliding tandem release, and the rear impact guard.
Control skills to rehearse
Basic control is tested on a closed course. You must demonstrate straight-line backing, offset backing to the left or right, and parallel parking (or an alley dock, depending on the layout). The examiner watches for pull-ups, the number of corrections, final position, and whether you use both mirrors and get out to check when unsure. Getting out to look is not a failure; hitting a cone or crossing a boundary is.
Traps in questions
Watch for these distractors: inspection order questions that place the coupling check after the brake test; items that belong to a single unit but not a combination (for example, checking a trailer brake chamber as if it were on the tractor); and backing questions that suggest you should rely on a spotter's hand signals instead of your own mirrors and a GOAL (get out and look) check. Another common trap is confusing a pull-up (allowed, but counted) with a hard stop that ends the maneuver.
Rule of thumb
Use the "three looks" habit before any backing maneuver: look at the path, look at your mirrors, and look again by getting out if the clearance is under a few feet. For inspection, remember "couple, then check": confirm the fifth wheel is locked and the tug test passed before you trust the trailer.
Worked example
If a question asks what to do first when backing an unfamiliar combination into a tight dock, the best answer is to stop, get out, and walk the path to check overhead clearance and obstacles, then back slowly using mirrors with a spotter if available.