Towing a camper trailer, caravan or boat is a huge unlock for camping freedom — but the road is unforgiving of sloppy setups. Overloaded couplings sway, under-loaded couplings get worse, and most insurance won't pay out if you've exceeded any of the legal limits.

Here's the essential towing knowledge — the weight terms, the legal limits, the safe-unhitch process, plus the real-world driving habits that separate confident tow drivers from the ones swerving across the road.

Photo by Kat Wallace on Unsplash

• ATM (Aggregate Trailer Mass) — total weight of trailer + load when NOT coupled to the tow vehicle. Stamped on the trailer compliance plate as a maximum
• GTM (Gross Trailer Mass) — same trailer + load when COUPLED to the tow vehicle. Lower than ATM because the coupling transfers some weight to the tow vehicle (the "ball load")
• Ball Load (or Towball Mass) — vertical weight pressing down on the towball at the coupling. Critical for handling. Typically 8-15% of trailer weight
• GVM (Gross Vehicle Mass) — the legal max weight of your tow vehicle (chassis, fluids, fuel, passengers, gear, and the ball load combined)
• GCM (Gross Combination Mass) — total combined weight of fully-loaded tow vehicle + fully-loaded trailer. Has its own legal max
• Tow capacity — manufacturer's stated max trailer weight your vehicle can pull. Different from GCM

You must stay UNDER each of these limits independently. Insurance and legal liability stop the moment any one is exceeded.

Most caravanners overload. They have no idea, because they've never weighed it. The fix takes one trip and $20:

1. Load the rig in full touring trim (water tanks full, gear packed, fuel topped up, kids in vehicle)
2. Drive to a public weighbridge (Google "weighbridge near me" — most truck stops have one)
3. Weigh the tow vehicle ALONE first
4. Then re-weigh with the trailer attached
5. Then weigh the trailer alone (after unhitching, in the same trim)
6. Calculate ball load = (vehicle alone) − (vehicle + uncoupled trailer)

Now compare to your compliance plates. Re-distribute load (move heavy items between vehicle + trailer) until you're under every limit. Some people are shocked to discover they've been towing 300kg overweight for years.

Photo: Daniele Nabissi / Unsplash

• Too LITTLE ball load — trailer sways uncontrollably, especially over 90km/h or in crosswinds. Highly dangerous. Major cause of jack-knife accidents
• Too MUCH ball load — overloads the tow vehicle's rear axle, lifts the front wheels (reduces steering grip), exceeds GVM
• Sweet spot — typically 8-15% of trailer weight (check your trailer manufacturer's spec). Heavier rigs sit at the higher end
• Adjust ball load by re-distributing trailer load — move heavy items forward (toward the towball) to add ball load; move them rearward to reduce
• Weight Distribution Hitches — for heavy caravans, these tools redistribute ball load back across both vehicle and trailer axles, transforming handling

Unhitching wrong has killed people — coupling pops, trailer rolls, anyone in front gets crushed. Follow this every single time:

1. Chock the trailer wheels front AND back with proper chocks (not random rocks)
2. Keep bystanders 15 metres clear to the side — never in front of, behind, or under the trailer
3. Engage the trailer handbrake
4. Lower the jockey wheel, ensuring it's locked in the down position and angled sideways (so the trailer can't roll free)
5. Wind the jockey wheel out — this transfers weight from the towball to the jockey wheel
6. Disconnect electrical plug + safety chains
7. Release the coupling lock, lift the coupling slowly off the towball, drive the vehicle forward gently

Hitching is the same in reverse. Always check the safety chains are crossed under the coupling (so they catch the coupling if it ever fails).

Photo: Iain / Unsplash

• Reduce speed. 90-95km/h is plenty even on highways. Many states have a 100km/h max for tow rigs anyway
• Increase following distance — your braking distance doubles or triples
• Use lower gears on long descents — engine braking saves your trailer brakes from overheating + fading
• Brake gently and early — heavy panic braking causes the trailer to push the vehicle
• Take corners wider — trailer wheels follow a tighter line than the tow vehicle's
• Reverse SLOWLY with small steering inputs. Counter-intuitive at first; gets easier with practice. Practise in an empty car park before your first trip
• Watch crosswinds + truck wash — sudden side gusts cause sway. Don't fight it; ease off accelerator (don't brake) and steer straight
• If sway starts: ease off accelerator, hold steering steady, gently apply trailer brake (if you have an electric brake controller). DON'T slam the vehicle brakes — that worsens it

• Electric brake controller — if your trailer has electric brakes (most modern caravans, many camper trailers do), you NEED a controller in the cab. Tekonsha P3, REDARC Tow Pro Elite are the gold standard
• Reversing camera — game-changer for solo hitching, reversing into tight sites
• Extended towing mirrors — required by law in most states for caravans wider than the tow vehicle
• Anti-sway bar / weight distribution hitch — for heavier caravans (typically 1500kg+ trailer)
• Tyre Pressure Monitoring System (TPMS) — alerts you to slow leaks before they become blowouts
• Brake controller proportional to load — better stopping balance

Towing competently is one of those skills that takes a few hours to learn and pays back for decades. Get the weights right (weighbridge first), get the ball load in the sweet spot, follow the unhitch process every time, and drive with the discipline a tow rig deserves.

The first 1000km is the steepest part of the learning curve. Practise reversing in an empty car park, do a few short trips before the big one, and you'll be towing confidently anywhere in Australia.