Fit & load tool

GVM, axle & tow ball — sorted.

Pick your 4WD, tick what you've already got bolted on, add your gear, then build your Base Station. We'll show what's left on your GVM, your rear axle, and your tow ball — the three numbers those comments are really about. Fully loaded, our Base Station is 150 kg, about 4–5% of most 4WDs' GVM.

~700KG
Typical payload off the floor
150KG
Base Station, loaded max
~225KG
That on the rear axle (1.5×)
350KG
Typical tow ball limit
The calculator

Build it. Load it. Check it.

Everything updates live in the panel as you go. Figures are a planning guide — always confirm against your compliance placard and a weighbridge.

01 Your 4WD
▾
GVM
kg
Payload
kg
Rear axle limit
kg
Tow ball limit
kg
Rear axle — empty weight (est.)
kg

GVM and payload are approximate for the popular grade and already include a full tank of fuel — so don't add fuel again below. Rear axle figures are indicative: the limit's on your placard, and the empty-axle weight is estimated from your kerb weight. Got weighbridge numbers? Type your real figures in. Both GVM and rear axle need to stay in the green.

02 What's already on your 4WD tick what applies
Fridge (40L)
In the boot or on a slide.
30 kg
kg
Roof rack + gear
Platform or bars with a bit up top.
30 kg
kg
Rear drawer system
Drawers / cargo system in the back.
40 kg
kg
Bull bar
Steel or alloy front bar — loads the front axle, not the rear.
60 kg
kg
Passengers
Everyone in the car, including the driver.
80 kg each
0
Camping gear & everything else
Swags, chairs, recovery kit, food, water, tools — the lot, in the back.
Total weight kg
03 Your Novaa Base Station all weights empty
Included
Novaa Base Station
Full swing-away, mounting rack, wheel holder, and cargo carrier (or double cargo carrier).
55 kg
Spare wheel
Full-size spare on the wheel holder.
30 kg
0
Jerry can (20L)
Fuel or water, on the cargo carrier.
2 kg empty · +20 kg full
0
20L Slimline Water Tank
Bolts to the cargo carrier.
7 kg empty · +20 kg full of water
0
Drop Table
Fold-down table off the rack.
5 kg
0
Anything else on the rack?
Any other gear riding on the Base Station.
Weight each kg
0
Your numbersLive
Payload off the floor735 kg
Vehicle accessories− 0 kg
Passengers− 0 kg
Camping gear− 0 kg
Left before the rack735 kg
Base Station (loaded)− 55 kg
Payload remaining
0kg
Payload used0%
—
Rear axle remaining indicative
0kg
Loaded rack ≈ 83 kg on the rear axle · 1.5× overhang
Rear axle used0%
—
Tow ball — left for a trailer
0kg
Loaded rack ≈ 55 kg on the tow ball (1×) · — kg trailer at 10% ball
Tow ball used0%
—

Rear axle is a guide, not a measurement — enter weighbridge figures up top for an exact number. Tow ball shows what the loaded rack leaves for a trailer; remember a trailer's own ball weight also adds to your GVM and rear axle above. Every limit must be respected to be legal.

Over the Base Station's limitThe loaded rack is over its 150 kg rating. Lighten what's on it before you load up.
Read me first

This calculator is a planning guide, not engineering certification. GVM is the most your whole vehicle is allowed to weigh, fully loaded. Payload already includes a full tank of fuel, so don't add fuel again. The rear axle has its own separate limit, and because the Base Station sits behind the rear axle it loads that axle at roughly 1.5× its weight — so a fully loaded 150 kg rack shows as about 225 kg on the rear axle, while it lifts a little off the front.

Tow ball download is the static downward force on your tow ball. The Base Station is a genuine pass-through hitch, so you keep towing — but the rack's weight and a trailer's ball weight share the same tow ball limit, so size the trailer to what's left. Vehicle figures shown are approximate for the popular grade and vary by model year and options. Rear axle results are indicative — they rely on an estimated empty-axle weight unless you enter your own weighbridge figures. Always confirm GVM, axle and tow ball ratings against your compliance placard, and run a loaded rig over a public weighbridge before a big trip. The Base Station is rated to 150 kg total, ADR compliant with a 3.5-tonne tow rating.

Your results

Want these numbers sent to you?

Pop in your email and we'll send your GVM, rear-axle and tow-ball results with a quick fitment guide. Close to a limit? Locky will help you set it up to stay legal.