Why Truck Drivers slid the Tandem Axles and The fifth wheel?

There are things that you did not learn in CDL driving school because the premier goal of the school is to get your CDL license, But the tricks and secrets of driving a truck trailer professionally you will learn them later when you actually start driving a truck trailer. Here is a group of tricks you will need in your working life as a truck trailer driver.

Moving Tandem Axle to Adjust The Weight Distribution

The total weight of the truck and trailer should be not more than 80K pounds, and must be distributed along the length of the truck as follows

  • 12K  at the steering axle
  • 34K  at drive axle 
  • 34K at  trailer axle or tandem axle 

  If the truck's weight distribution differs from the above, you must adjust the distribution by pushing the trailer axle and/ or the fifth wheel forward or backward.

A trailer tandem slide forward is gonna add more weight to tandems or the trailer axle and is gonna take more weight off the drive axle. 

A trailer tandem slide further to the back is gonna take more weight off of the trailer axle or the tandem axle and it's gonna add more weight to the drive axle.

Moving Tandem Axle to make easy turns

A trailer tandem slide forward is gonna be better for off tracking. In other words the trailer is going to do a better job of following the truck. This is better for city environments.

A tandem slid all the way to the back is gonna promote more drastic off tracking.

Moving Fifth Wheel to Adjust The Weight Distribution

fifth wheel slide it further to the back it's gonna add more weight to the drive axle and it gonna take weight off of the steer axle.

move your fifth wheel forward gonna take weight off of the drive axle and it's gonna add weight to the steer axle.

Attention When Moving Fifth Wheel

When moving the fifth wheel forward you need to be careful of how much distance is between the truck and the bulkhead of the trailer and you also need to be careful of the distance between the mud flaps and the landing gear.

move your fifth wheel backwards moving your trailer further away from the truck you need to be cognizant of your wires. you don't want to get in the middle of a 90 degree turn and have your red wire pop while you're in the middle of a turn because your trailer is too far away from your truck

 

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There are things that you did not learn in CDL driving school because the premier goal of the school is to get your CDL license, But the tricks and secrets of driving a truck trailer professionally you will learn them later when you actually start driving a truck trailer. Here is a group of tricks you will need in your working life as a truck trailer driver.

Moving Tandem Axle to Adjust The Weight Distribution

The total weight of the truck and trailer should be not more than 80K pounds, and must be distributed along the length of the truck as follows

  • 12K  at the steering axle
  • 34K  at drive axle 
  • 34K at  trailer axle or tandem axle 

  If the truck's weight distribution differs from the above, you must adjust the distribution by pushing the trailer axle and/ or the fifth wheel forward or backward.

A trailer tandem slide forward is gonna add more weight to tandems or the trailer axle and is gonna take more weight off the drive axle. 

A trailer tandem slide further to the back is gonna take more weight off of the trailer axle or the tandem axle and it's gonna add more weight to the drive axle.

Moving Tandem Axle to make easy turns

A trailer tandem slide forward is gonna be better for off tracking. In other words the trailer is going to do a better job of following the truck. This is better for city environments.

A tandem slid all the way to the back is gonna promote more drastic off tracking.

Moving Fifth Wheel to Adjust The Weight Distribution

fifth wheel slide it further to the back it's gonna add more weight to the drive axle and it gonna take weight off of the steer axle.

move your fifth wheel forward gonna take weight off of the drive axle and it's gonna add weight to the steer axle.

Attention When Moving Fifth Wheel

When moving the fifth wheel forward you need to be careful of how much distance is between the truck and the bulkhead of the trailer and you also need to be careful of the distance between the mud flaps and the landing gear.

move your fifth wheel backwards moving your trailer further away from the truck you need to be cognizant of your wires. you don't want to get in the middle of a 90 degree turn and have your red wire pop while you're in the middle of a turn because your trailer is too far away from your truck

 

Expanded practical guidance

This expanded section gives readers more detail about Why Truck Drivers slid the Tandem Axles and The fifth wheel?. It focuses on truck and trailer equipment, weights, dimensions, coupling, tires, fuel use, and maintenance cost planning, with practical checks readers can use before making a decision, taking a test, buying equipment, repairing a vehicle, or accepting work.

What to verify first

  • Confirm vehicle ratings: GVWR, GCWR, axle ratings, tire ratings, hitch or kingpin limits, trailer length, height, width, and legal route weight limits.
  • Inspect tires, brakes, suspension, lights, air and electrical lines, landing gear, coupling devices, frame, doors, seals, and cargo securement points.
  • Use scale tickets and axle weights when load placement, tandem sliding, fifth-wheel position, or trailer selection affects compliance.
  • Estimate cost by including parts, labor, downtime, road service, fuel, permits, tolls, inspections, and preventive maintenance.

Practical steps

Measure equipment before tight docks or low-clearance routes, check tire age and pressure, verify coupling with a tug test, adjust weight only on safe ground, and schedule preventive repairs.

Common mistakes to avoid

Avoid assuming a trailer is legal because it looks empty, ignoring bridge height or tail swing, using fuel estimates without terrain and idle time, or delaying tire, brake, or suspension repairs.

Records, costs, and timing

Save scale tickets, inspection reports, repair invoices, tire dates, part numbers, fuel logs, permits, and defect photos. Equipment decisions affect stopping distance, stability, compliance, and everyone’s safety.

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