What Your Van Will Actually Pull: Towing Without the Guesswork

Most trades don't tow every day. That's precisely why the rules catch people out — you hire a plant trailer twice a quarter, hook it up, and assume the same rules that applied to your mate's Transit apply to yours. Sometimes they do. Sometimes you're 200kg over a plated limit and your insurance is quietly worthless.

None of this is difficult once you've got the numbers in front of you. It's just that the numbers are spread across three plates, a V5C and your driving licence, and nobody hands you a crib sheet at the builders' merchant.

Start with the plates, not the brochure

There are two figures that matter on the van itself: the gross vehicle weight (GVW) — the most the van can weigh fully loaded — and the gross train weight (GTW), which is the most the van and a loaded trailer can weigh together. Both are stamped on the VIN plate, usually under the bonnet or on a door pillar.

Subtract GVW from GTW and you get the maximum plated trailer weight. That's your ceiling, but it isn't automatically the number you can use. The manufacturer's own towing limit, listed in the handbook, is sometimes lower — and it can vary by engine, gearbox and body style. A panel van that's fine with 2,000kg behind it in one trim might be rated at 1,500kg in another.

Then look at the trailer's plate. It shows the trailer's own maximum authorised mass (MAM), not what it currently weighs. Enforcement works off the plated figures, so a 2,000kg trailer loaded to 900kg still counts as a 2,000kg trailer for the purposes of your licence and your van's limit. That single fact ruins more towing plans than anything else.

Which licence have you actually got?

If you passed your car test after 1 January 1997, you've got category B. That lets you drive a vehicle up to 3,500kg and tow a trailer up to 750kg. You can tow something heavier than 750kg, but only if the combined MAM of van and trailer stays at or below 3,500kg — which, with a loaded 3.5-tonne van, is effectively never.

So for a typical 3.5t panel van plus a 2-tonne plant trailer, you need B+E. If you passed your test before 1997, you inherited B+E and can run a combination up to 8,250kg without an extra test. Everyone else is looking at a B+E course and test, which is a day or two of training plus the test fee — cheap next to the fine and the six points for driving otherwise than in accordance with a licence.

It's worth checking the code numbers on the back of your photocard rather than assuming. Licences get reissued, entitlements get lost in the post, and hire desks and insurers will check.

The 750kg line and trailer brakes

Anything with a plated weight over 750kg needs its own brakes — in practice, overrun brakes that engage as the trailer pushes into the towball — plus a breakaway cable. That cable isn't decoration. If the coupling lets go, it's meant to pull the trailer's handbrake on before the hitch hits the tarmac.

Check how it's attached. On many setups the cable loops around the towball and back onto itself, which is fine; on others it should clip to a dedicated anchor point on the towbar. If it's just draped over the ball with no positive connection, it will do nothing when you need it most.

Also worth knowing: trailers over 750kg sold new since 2012 need type approval or an individual vehicle approval, and trailers used for hire or reward can need their own annual test. Buy second-hand and you inherit someone else's paperwork problem, so ask.

Nose weight, loading and the wobble

A trailer that snakes at 55mph is almost always badly loaded. Put the heavy kit over the axle, not at the back, and keep the nose weight within the towbar's limit — usually somewhere between 50kg and 100kg, often 75kg on a light commercial towbar. Too little and the trailer feels flighty; too much and you're unloading the front axle of the van, which does nothing good for steering or headlights.

Before every run: coupling latched and the handle down, jockey wheel wound up and stowed, electrics plugged in with all lights tested, tyres at the right pressure, load strapped so it can't shift. Two minutes with a torch now beats a motorway hard shoulder later.

Hire vans and the towing clause

Here's the one that surprises people. A lot of van hire agreements prohibit towing outright, and plenty of the ones that allow it exclude trailer damage from the cover. Turning up at a rental desk with a trailer on the back and no prior arrangement is a quick way to lose a deposit and possibly the booking.

If you're hiring specifically to tow, say so at the point of booking, get it in writing, and confirm the vehicle actually has a towbar rated for your trailer. Plenty of hire fleet vans don't have one fitted at all.

Speed limits, mirrors and the rest

When you're towing, the limits drop. On a single carriageway it's 50mph, dual carriageway 60mph, motorway 60mph. Extended mirrors are a legal requirement if you can't see clearly down both sides of the trailer with the standard ones, and reversing with a trailer on is a skill worth practising in an empty car park before you're doing it between two gateposts on a customer's driveway.

One more thing for anyone hauling goods commercially: if your combination tips over 3,500kg, tachograph and drivers' hours rules can come into play, and the operator licensing position isn't always as clear-cut as a forum post suggests. If towing is a regular part of the business rather than the occasional errand, get proper advice rather than assuming a 3.5-tonne van keeps you out of scope.

A five-minute check before the first job

Plated GTW minus GVW, manufacturer's towing limit, trailer MAM, licence entitlements, breakaway cable, lights, tyre pressures, nose weight, insurance notified, hire firm informed. Get those sorted once and towing becomes what it should be: a practical way to move kit, not a rolling compliance risk.