
FEDERALLY APPROVED SSM
GVM - GCM - BTC UPGRADES
TJP Auto is Tasmania’s premier destination for certified GVM upgrades and heavy-duty towing solutions.
Whether you are a tradie with a loaded canopy or a tourer pulling a heavy caravan, we ensure your vehicle remains legal, safe, and insurance-compliant.
With decades of suspension expertise and hundreds of successful builds across Hobart and Tasmania, we specialise in increasing your Gross Vehicle Mass (GVM) and Gross Combination Mass (GCM). Using industry-leading components from Lovells, Formula 4x4, DMW, Bilstein and Tough Dog, our in-house engineering team streamlines the compliance process for both pre-registration (SSM) and post-registration vehicles.
Don’t risk an overweight vehicle—get the payload you need with Tasmania’s suspension experts.





SEE WHAT OUR CUSTOMERS ARE SAYING !
Discover why our clients trust us for all their automotive needs. Read genuine reviews from satisfied customers who have experienced our reliable and honest service first hand.
Pre-rego upgrade
Kits installed and certified prior to first registration. Included on the federal compliance plate for hassle-free Australia-wide legal operation.
Post-rego upgrade
State-based engineering certification for vehicles already on road. Our Hobart workshop provides full engineering compliance for Tasmania and beyond.
GCM upgrade
Increase your Gross Combined Mass for heavy-duty towing and touring. Engineered solutions to safely increase both payload and towing capacity simultaneously.
Brake Towing upgrade
Boost your towing capacity with certified suspension and braking upgrades. Quality components for safe and compliant heavy-duty hauling.
NOT SURE ON YOUR WEIGHT ?
Not sure on what your current vehicle may weigh or what your new build may weigh ? Try our GVM - GCM Calculator its a great free tool and guide to help you with some of those tricky calculations
WANT YOUR VEHICLE WEIGHED?
At TJP Auto we have a in house scale system where we can quickly weigh your vehicle to determine what it weighs, this process only takes 5 minutes and afterwards you can have a discussion with our team in regards to your needs.
This is completely free GVM Assessment
DEFINITIONS
GVM
Gross Vehicle Mass “GVM” Weight transmitted by all tow vehicle axles to the ground
GCM
Gross Combination Mass “GCM” Sum of all axle loads; vehicle and trailer combined
BTC
Braked towing capacity of the vehicle towing a trailer with a braking system
PAYLOAD
The difference between your GVM and your Kerb weights, carrying capacity
KERB
Vehicle weight specified by manufacturer (normally full fuel and Factory options)
TARE
Vehicle weight specified by manufacturer empty normally no fuel or options
GTM
Gross Trailer Mass Weight transmitted by all trailer axles to the ground
ATM
Aggregate Trailer Mass Trailer mass including tow ball down weight
FAC
Front Axle Capacity “FAC” Weight on tow vehicle front axle
RAC
Rear Axle Capacity “RAC” Weight on tow vehicle rear axle
OEM
Original equipment manufacture in context of this page would be OEM specifications
.png)