Towing a trailer from Canberra to the coast
Most Canberra trailers make the same trip: Kings Highway, over the Clyde, into Batemans Bay. This is the hill, the rules that apply on it, what salt water does to a boat trailer, and the checks that get you home with the bearings you left with.
The Kings Highway and the Clyde
The Kings Highway runs about 139 km from Canberra through Bungendore and Braidwood to Batemans Bay. The part that matters is Clyde Mountain, about 27 km short of the coast, where the road drops from roughly 780 metres to near sea level through tight bends and hairpins with almost nowhere to overtake. NSW crash data pulled by Region Canberra counted 14 crashes on the descent between 2018 and 2022, one of them fatal. Transport for NSW publishes no gradient or length for the descent, so we have not invented one.
Getting down without cooking the brakes
Low gear at the top, not halfway down
The National Heavy Vehicle Regulator's advice to truck drivers applies just as well to a ute and a boat: shift to a low gear before the descent begins, so the engine holds your speed and the service brake is saved for emergencies instead of overheating.
Brake fade is a smell before it is a problem
The signs are a hot smell and a pedal that goes soft or long. Brake firmly and briefly, release, repeat. If it starts to fade, stop somewhere safe and let everything cool.
Electric brakes need the controller set for the load
Set the controller on a quiet road with the trailer loaded, before Braidwood, not on the first hairpin. The brake thresholds by weight are on towing capacity and in the cards below.
If the trailer starts to sway
The NSW Government's instruction is blunt: do not apply the vehicle's brakes except as an absolute last resort. Ease off, hold the wheel straight, let it settle. Then fix the load at the next safe stop, because sway nearly always means weight too far back.
What the law says on this trip
Speed
NSW caps a single trailer at 100 km/h only when the tow vehicle's GVM, or the combination's GCM, is over 4.5 tonnes. Under that, the signed limit applies. The ACT has no separate towing limit.
Brakes by weight
Up to 750 kg GTM, no brakes required. 751 to 2,000 kg GTM, brakes on both wheels of at least one axle. Over 2,000 kg GTM, brakes on all wheels plus a breakaway system, which VSB1 says must hold the brakes on for at least 15 minutes.
Safety chains
One chain under 2,500 kg loaded, two above it, crossed and kept as short as practical. Chains are mandatory on any trailer without breakaway brakes and on any rigid drawbar.
Who can tow
In NSW, learner drivers cannot tow, and P1 car licence holders are limited to a trailer of up to 250 kg unloaded. One trailer at a time.
Ball weight and balance
NSW's guidance: 5 to 10 per cent of the loaded trailer mass on the coupling, about 60 per cent of the load ahead of the axle centre, heavy items low and near the axle, drawbar level or slightly nose down.
Tyres and heat
Set pressures cold, to the trailer plate or the tyre's load table. Warm tyres read higher after an hour on the highway; never bleed air from a warm tyre or it will be under-inflated when it cools.
Salt water and bearings
The ramp is where coast trips go wrong. A hub that has just come down the Clyde is hot, and backing it into cold water lets water seep past the seals. Salt water in a bearing becomes rust, and a bearing that failed quietly on the ramp fails loudly on the Clyde on the way home.
- Grease the bearing protectors before the trailer goes in. The grease cools the hub and keeps the water out.
- Rinse hubs, brakes, springs and chassis with fresh water the same day. Galvanising does not excuse you from the hose: see galvanised vs painted.
- Have the bearings repacked and the brakes checked about every six months if the trailer is dunked regularly. What a service covers is on servicing and repairs; Resort Trailers' own trailer servicing page lists what their workshop does.
- Feel each hub after the first few kilometres home. Warm is normal; too hot to hold means stop.
The walk around
The NSW Government's pre-trip list, plus what most often catches people on the Clyde. The long version is our trailer safety inspection checklist.
- Coupling latched and pinned on the right size ball; chains connected, crossed, with rated shackles.
- Lights: brake, tail, indicators and plate light, with someone watching.
- Tyres inflated cold, spare included, no cracked sidewalls.
- Bearings, suspension and brakes checked; controller set for this load.
- Load tied down and covered, nothing more than 150 mm past the sides, a red flag on anything more than 1.2 m past the back.
- Boat: winch strap and safety chain on, transom tie-downs on, bung in, outboard up and locked.
Where to pull over
West of Braidwood, the Warri Bridge rest area at the Shoalhaven River is the place to check straps and tyres. Braidwood has room to park a trailer, and Nelligen at the bottom of the hill is where to feel the hubs and let the brakes cool. Pooh Bear's Corner near the top of the descent is a cave on a sharp bend with a small sign that is easy to miss: not a rest area, and with a trailer on there is no safe way to stop. Live Traffic NSW shows rest stops and closures.
After the trip
Rinse again if the trailer has been in the water, then check three things. Hubs: any that ran hot get the bearings looked at before the next trip. Brakes: the Clyde takes more out of them than a year of tip runs, so check pad or shoe wear and the breakaway battery. Coupling and chains: wear in the ball socket, stretched links. Coast trips every summer mean a service by autumn.
Monaro Highway and the snow
Between the June and October long weekends every two-wheel-drive vehicle entering Kosciuszko National Park must carry snow chains, and police check. Four and all-wheel drives are exempt but the NSW Government still recommends carrying them, and cars on chains should stay under 40 km/h. The chain rules say nothing about trailers, so on snow a trailer follows the car with no grip of its own. The NSW snow advice, brake gently and early, leave a long gap, never overtake on a hill or bend, counts double with a trailer behind you.
Where this comes from
Checked 30 October 2026. Road rules and vehicle standards change, so confirm the current position before you rely on a figure.
- NSW Government: towing a trailer or caravan (speed, brakes, chains, loading, pre-trip checks)
- Australian Government: Vehicle Standards Bulletin 1, Revision 6 (trailer brakes, breakaway, chains)
- National Heavy Vehicle Regulator: steep descents and low gear (January 2025)
- NRMA: towing speed limits by state (ACT has no separate limit)
- Region Canberra, January 2024: Clyde Mountain crash data 2018 to 2022
- Wikipedia: Kings Highway (length and route)
- Wikivoyage: Kings Highway (stops, Warri Bridge rest area, Pooh Bear Corner)
- NSW Government: driving in snow (chain rules and snow driving advice)
- NSW Government: Princes Highway and the south (Live Traffic rest stops)
- Boat Accessories Australia: hot hubs, bearing protectors and six-monthly bearing service
- TyreSafe: check caravan and trailer tyre pressures cold
- Maxxis: never reduce pressure in a warm tyre
Keep reading
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