Lesson 1Trailer-specific components: tires, bearings, seals, spare, wheel nuts torqueDis part cover how to check trailer tires, wheels, and running gear. You go check tire age and pressure, wheel nut torque, bearings, seals, and spare tire to stop blowouts, hot hubs, and wheel problems on di road.
Checking tire size, load index, and speed ratingSetting cold inflation pressure for towingInspecting tread, sidewalls, and tire ageWheel nut torque checks and retorque stepsBearing and seal inspection and lubricationLesson 2Mirrors, camera systems, and field of view checks for towing configurationsDis part explain how to set mirrors and cameras for towing. You go adjust side mirrors, add extensions if need be, set rear and side cameras, and check blind spots for safe lane change and backing.
Adjusting side mirrors for trailer widthUsing clip‑on or replacement tow mirrorsConfiguring rear and side camera viewsChecking blind spots and overlap zonesField of view checks before departureLesson 3Trailer structural inspection: frame, floor, axle, suspension, coupling points, rust and deformitiesDis part look at trailer strongness. You go check frame, crossmembers, floor, axles, suspension, couplers, and safety chains for cracks, rust, bend, or loose bolts wey fit cause big problem.
Inspecting frame rails and crossmembersChecking floor panels and deck fastenersAxle alignment, mounts, and U‑boltsSuspension springs, bushings, and hangersCoupler, latch, and safety chain conditionLesson 4Match vehicle and trailer ratings: GVWR, GCWR, hitch class, tongue weight limits, payload vs cargo massDis part show how to match tow vehicle and trailer ratings so everything stay safe. You go read GVWR, GAWR, GCWR, hitch class, tongue weight, and payload to avoid overload and shaky towing.
Reading VIN and weight rating labelsUnderstanding GVWR, GAWR, and GCWRHitch class ratings and receiver limitsTongue weight limits and distributionPayload vs cargo and passenger massLesson 5Documentation and placarding: VIN, registration, insurance, placards for heavy loadsDis part explain di papers and marks you need for legal towing. You go check VIN plates, registration, insurance, and placards for heavy or dangerous loads, plus weight and size marks.
Locating and reading VIN plates and stickersVerifying registration and insurance papersWeight, dimension, and capacity placardsSpecial placards for hazardous materialsStoring documents for roadside inspectionLesson 6Towing vehicle pre-trip checks: tires, tread depth, inflation, spare tire conditionDis part explain pre-trip checks for di tow vehicle. You go check tire condition, tread depth, air pressure, and spare tire, and make sure di vehicle ready for extra trailer weight.
Inspecting tow vehicle tire tread depthChecking sidewalls for cuts and bulgesSetting correct tire pressures for towingSpare tire condition and access toolsQuick under‑hood and underbody scanLesson 7Brake system inspection: service brakes, parking brake, trailer brake controller settingsDis part focus on brakes for di whole setup. You go check service and parking brakes, set trailer brake controller, and test low-speed to make sure stops straight and steady.
Checking pedal feel and brake warning lightsParking brake hold test on a gradeAdjusting trailer brake controller gainTesting trailer brakes at low speedRecognizing brake fade and imbalanceLesson 8Fluid and engine checks: oil, coolant, transmission fluid, power steering, windshield washerDis part detail engine bay and fluid checks before towing. You go check oil, coolant, transmission fluid, power steering, and washer fluid, and spot leaks or overheating risks under heavy load.
Engine oil level, condition, and top‑offCoolant level, strength, and hose inspectionAutomatic transmission fluid checksPower steering fluid and assist systemsWindshield washer fluid and spray patternLesson 9Lighting and electrical checks: headlights, tail lights, turn signals, brake lights, wiring harnessDis part focus on lights and electrical for good visibility. You go test headlights, marker and tail lights, turn and brake lights, and check wiring and ground to avoid shorts and failures.
Testing headlights and auxiliary lightsChecking tail, marker, and license lightsTurn signal and brake light operationInspecting trailer plug, socket, and wiringGround connections and corrosion controlLesson 10Pre-departure checklist routine and how to document inspections (forms and photos)Dis part teach how to use steady pre-departure checklist. You go do walk-around, check all key things, and record with forms and photos for maintenance and to follow rules.
Designing a step‑by‑step walk‑aroundUsing printed or digital checklist formsTaking photos of key inspection pointsRecording defects and corrective actionsStoring records for audits and resaleLesson 11Simple load-rating calculation examples: tongue weight percentage, gross trailer weight vs tow vehicle capacityDis part give simple load calculations for towing. You go figure tongue weight percent, compare trailer weight to tow ratings, and use real examples to stay under limits.
Estimating gross trailer weight from cargoCalculating tongue weight percentage rangeComparing GTW to tow vehicle capacityChecking axle and tire load distributionUsing scales to verify actual weightsLesson 12Trailer braking systems: surge brakes, electric brakes, breakaway switch and battery checksDis part cover trailer brakes and pre-trip checks. You go compare surge and electric brakes, test breakaway switch and battery, and set controller for good stopping under load.
Identifying surge vs electric brake systemsVisual inspection of brake hardwareTesting electric brake controller outputChecking breakaway switch and lanyardBreakaway battery charge and wiring
