Michigan CDL Doubles/Triples study plan

List, in order, every step of the coupling sequence for a tractor pulling two trailers, from backing under the first trailer to the final tug test on the rear unit

Identify which coupling steps must be repeated for the second trailer and explain why the converter dolly changes the order

Label on a blank sketch the five connection points between tractor, first trailer, dolly, and second trailer: fifth wheel, dolly drawbar, safety chains, air lines, electrical cord

State the correct walk-around sequence for verifying that a dolly is locked to the lead trailer before backing under the rear trailer

Recite the full uncoupling sequence in reverse order and name the two steps most often skipped under time pressure

Match each air line (service, emergency/supply) and the electrical cord to its correct gladhand or receptacle on tractor, lead trailer, and dolly

Explain the color-coding and location rules for gladhands and describe how a crossed service/emergency line shows up on the dash gauge

Describe the correct way to secure and store coiled air lines and cords so they do not drag or chafe

Perform a complete pre-trip inspection of a doubles or triple combination in the correct front-to-back order, naming each item aloud

Explain why a dolly needs its own inspection separate from the trailers and list the dolly-specific items to check

Identify the coupling system components (fifth wheel jaws, kingpin, locking pins, safety latches) and describe the visual and tug-test checks for each

Describe how to check that the rear trailer's brakes and lights respond from the cab before moving

Detect and describe five common air line and electrical faults: chafing, cracked gladhand seals, missing cotter pins on gladhands, corroded plugs, and lines routed over sharp edges

Explain the air pressure loss test and state what a steady drop on the gauge after engine shutdown tells you about the combination's air system

Describe how to test the trailer emergency (spring) brakes on both trailers by pulling the supply line and watching for full application

Explain the correct procedure for checking that all trailer brakes apply and release together, and why a dragging brake on the rear unit is a serious hazard

Explain off-tracking for doubles and triples and calculate roughly how far the rear trailer cuts the corner compared with a single trailer

Describe the correct turning technique for a multi-trailer combination, including when to start the turn and how to watch both trailers in the mirrors

Explain why sudden lane changes and hard braking are more dangerous with multiple trailers, including the rearward amplification effect

List the coupling errors that cause a trailer to come loose in motion and the pre-move checks that prevent each one

Describe safe following distance and speed selection for doubles and triples on dry, wet, and downhill grades, and state why the posted limit is often too fast

Explain how to handle a jackknife or trailer sway situation and what inputs make it worse

Describe the correct procedure for backing a multi-trailer combination, including when backing is not advisable and how to use a spotter

List the conditions that require stopping and checking the combination, such as after a hard bump, a sharp turn, or a long grade

Walk through the full pre-trip and coupling sequence end to end without notes, within the time allowed for the skills test

Demonstrate the tug test, air line check, and light check in the correct order and state what a failed check means

Answer 40 practice questions across all five domains and log every miss by domain

Re-drill the two weakest areas until each is answered correctly twice in a row

Review the error log from week 7 and re-explain each missed item aloud in your own words

Rehearse the coupling and uncoupling sequences one final time, narrating each step and the reason for it

Take a timed 50-question practice exam covering all domains and score at least 85 percent

Write a one-page cue sheet of the ten facts you are most likely to forget and read it the morning of the test