Cobra 7750 PLT Operating Hints Manual page 8

2.2) Description of Weight Settings
Gross Weight:
Weight per Axle:
Tandem Axle Weight:
Tridem Axle Weight:
Unladen Weight:
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The total weight of the truck when it is loaded.
You must calculate this using standard, accepted methods.
The weight on the double-axle at the back of the truck.
The weight on the triple-axle (see images below).
The total weight of the truck when the trailer is empty.