Gross Vehicle Weight is what a vehicle weighs at any given time. If you drove onto a scale you would see your present Gross Vehicle Weight. It can change depending on what you have in the vehicle...
it is the weight of a vehicle with a full tank of gas and no cargo and no passengers.
The weight of a vehicle at full capacity. That includes payload for trucks, passengers, cargo etc
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Check owner's manual. If you don't have one copy and paste link below; www.fleet.ford.com/maintenance/owners_manuals
How to Weigh A Commercial Vehicle Part 4/7
How to Weigh A Commercial Vehicle Part 2/7
How to Weigh A Commercial Vehicle Part 5/7
How to Weigh A Commercial Vehicle Part 1/7