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Application

Vocation?

Bodies are typically and open box with any auger or mixer. Low speed operation in a very dirty environment. Drivers know more about the process than the truck.

Full Truck or Tractor?

Vehicle is built with a fifth wheel and has equipment installed by upfitter.

Sleeping Compartment ?

No Sleeper

Imperial 
Weights
Metrics
Weights

Desired Total GCW/GVW?

<- ENTER VALUE IN POUNDS

Desired Steer GAWR?

Adding a lift allows you to increase
GCW/GVW or shorten the wheelbase 

<- ENTER VALUE IN POUNDS

Desired Total Drive GAWR?

<- ENTER VALUE IN POUNDS

Select Front Axle Style

Select Rear Axle Style

Steer Axle?

Rear Axle Style?

Lift Axle Required

Weight > GAWR or Fed Bridge 

 Calculated weight in excess of 80K may require lift axles

Lift Axle/s ? 

No Lift Axle is being considered

Adding a lift axle allows you to increase GCW/GVW or shorten the wheelbase

Bridge Law/Permit ?

Select Applicable Bridge Laws or Permits 

Inches

Millimeters

WheelBase ?

Inches measured from centerline of front axle to center of the rear axle group defined under Rear Axle Style. 

Rear Axle Spacing ?

Spacing should be close as possible for best tire wear, at least 54 inches for most lift axle applications.

FAX to Back of Cab? 

Enter inches. Varies by model and axle setting. Used to arrive at wheelbase requirement and load space.

Cab to Body Gap ? 

If vehicle is a semi-tractor then this field should be zero. Enter inches for trucks with a body.

Body Length ?

If vehicle is a semi-tractor then this field should be zero. Enter inches for trucks with a body.

Body Front to  Bogie/Trunnion? 

Takes into account the gap value. Use a zero for Cab to Body Gap if you want to calculate cab to axle.

Cutoff/After Frame (Min) ?

Tractor values are static. Typically used for bodied trucks.

Inches

Millimeters

Overall Bridge

Review Bridge Law to verify the Overall Bridge for calculated Axle Count and compare to Desired GCW/GVW.

Axle Count

Calculated value. 

Minimum Wheelbase

Does not take into account lift axles, vertical exhaust behind cab/sleeper, or trailer swing/dip clearances.

Constraints Messages- click on constraint to address issue 

1. Typical front axle rating must exceed 13,000 lbs. with a sleeper larger than 75 inches.

2. Federal Bridge allows rounding up to next foot with half feet increments.

3. Reduce Desired Total GCW/GVW to eliminate lift axle requirement

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