Built Right with AJ

P01: GVM. Gross Vehicle Mass. The most important number on your compliance
plate, and the one most owners don't actually know.

This week we're tackling the loaded rig through the engineer's-mindset lens
we set up in EP00. The lexicon of weights you need to know, what GVM
actually limits in engineering terms (not just legal), two big questions
from the Downs 4WD Club, and how to find out where your rig actually sits.

What's covered:

  • The lexicon — Tare, Payload, GVM, ATM, GCM

  • Why GVM is an engineering limit, not just a legal one

  • How GVM and GCM relate, and the trap that catches people

  • The rooftop tent question — static vs dynamic rack ratings

  • The airbags question — why they're a band-aid, not a fix

  • Where people get caught — accessory creep, the towing trap, tow ball download

  • How to actually do the math at the weighbridge


Mentioned in this episode:
John Cadogan / Auto Expert on airbags — worth your time if you want to go deeper:
 
• Should you fit airbag suspension for towin... 

Thanks to the Downs 4WD Club for having me out — properly engaged crowd, two
of the questions from that night anchor this episode.

Ask Willy — free intake, plain explanations:
https://totalengineeringmods.com/ask-willy

10% of every Engineering Engagement goes to Pankind Australia in memory of
William:
https://pankind.org.au

Next week: GVM upgrades. What they actually change, what gets certified,
when GVM alone is the answer, and when GCM needs to come with it.

What is Built Right with AJ?

A show about doing it right the first time. AJ Elgayar — engineer, mechanic, sixteen years Army veteran — covers vehicle builds, modifications, and the engineering thinking that gets a project across the line properly. Cars, four wheel drives, touring rigs, tradie utes — the principles don't change.