What does the Tandem Axle & Cargo Spread Simulator do?

It lets you practice how sliding trailer tandems and moving cargo changes axle weights in real time (steer, drives, trailer, and gross). It’s designed for training reps so you can see weight transfer before heading to a scale.

Can I add multiple cargo blocks and use inches instead of feet?

Yes. You can add multiple cargo items, drag them to reposition, and switch cargo units between feet and inches for fast training without manual conversions.

Does it support drop axles and different equipment setups?

Yes. You can configure trailer type and length, choose tractor configuration, and toggle a drop axle on/off to see how settings affect axle distribution.

Can I import/export my scenarios for coaching or documentation?

Yes. The simulator supports Import and Export so you can save, share, and review scenarios. Supported formats include JSON and CSV for import/export, plus export options like XLSX and PDF.

Is this a legal compliance tool or a certified scale substitute?

No. It’s a training and educational simulator. Always verify weights using certified scales and follow your state/local DOT regulations.

Freight Girlz Tandem Axle Simulator for Cargo Spread & Load Placement

Unit & Setup

Pick a template, then fine-tune sliders and geometry. Expert mode unlocks custom truck settings.

Unit: —

Tractor Template

3rd Axle (Drop / Lift)

Trailer Axle Group

Rule Profile (optional)

Unit ID

Notes (saved in JSON)

Load & Weight

Choose total freight weight and where it sits (CG). Use pallet mode in Expert for row-by-row realism.

Legal: —

Freight Weight (lb)

Tractor Tare (lb)

Trailer Tare (lb)

Fuel (gal)

Load CG from Kingpin (ft)

CG position: — ft (0 = at kingpin, higher = farther back)

Tandem Slide (holes)

Slide: — holes (negative = forward, positive = back)

5th Wheel Slide (notches)

5th: — notches (negative = forward, positive = back)

Drop Axle Share (when DOWN)

Share: —% of “drive group” carried by drop axle

Spread Spacing (ft)

Expert Mode • Custom Truck Settings off

Enable Expert Mode

Unlock geometry + axle spacing + pallet mode presets.

Wheelbase (ft, steer→drive center)

Kingpin from Steer (ft)

Kingpin→Trailer Group Center (ft)

Tractor CG from Steer (ft)

Trailer CG from Kingpin (ft)

Tandem Hole Spacing (in)

5th Notch Spacing (in)

Fuel weight (lb/gal)

Axle Count (combo)

Outer axle spacing L (ft, steer→rearmost)

Steer limit (lb)

Drive group limit (lb)

Trailer group limit (lb)

Gross limit (lb)

Drop axle limit (lb)

Freight model

Expert mode is for “your exact truck/trailer.” If you don’t know a value, leave the template defaults.

Scale Results

Live axle predictions + bridge check + legality flags. Export includes full geometry + assumptions.

Bridge: —

Vehicle Visual

Trailer — Drop — Tandems — 5th —

Kingpin: — Bridge max: — Outer span: — Spread: —

Steer

—

Drives

—

Trailer Group

—

Gross

—

Steer axle

—

Drive tandem

—

Trailer axles

—

Coach Mode

Actionable moves (tandems / 5th / drop share) based on your current setup.

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Disclaimer: This is a static estimator. Real scales can vary due to suspension, grade, load shift, and equipment specifics.