Can My Car Tow a Caravan? Tow-Car Matching & the 85% Rule

You have a car and your eye on a caravan, and the real question is whether the two go together safely and legally. That is a matching decision, and it is not settled by one number on a spec sheet. This guide gives you the five checks that decide a pairing, then the 85% kerbweight rule — the figure people most often mistake for the law. Where it uses MTPLM, MiRO, MAM or kerbweight as shorthand, the UK caravan-weights pillar defines each term in full; here they are just the inputs to the decision.

Can my car tow a caravan?

Your car can tow a given caravan when five checks all hold at once — and the headline towing rating is only the first of them. Work down the list in order; the pairing is sound only when none of the five gives way, and a separate stability guideline (the 85% rule below) sits alongside them.

Checks 1, 2, 3 and 5 are the law. Check 4 is capped by physical engineering limits, with a loading target of 5–7% of the caravan's laden weight as guidance within that cap. GOV.UK sets out the gross train weight rule, the way the car and trailer are treated, and where the figures live: the handbook or specification sheet, the car's plate, and the gross train weight on the VIN plate. The caravan's MTPLM and MiRO are stamped on the caravan's own weight plate.

The clubs frame this as a checklist for a reason. The National Caravan Council's own matching steps and the Camping and Caravanning Club's final-checks list both run through the same ground — licence, the car's gross weight, the caravan's MTPLM, the combined weight against the car's gross train weight, and the towball — rather than leaning on any single figure. A high towing rating clears check 1 and says nothing about the other four. That is the gap the stated towing limit alone doesn't prove; the matching decision is the whole list.

What is the 85% rule, and is it the law?

The 85% rule says a novice should keep the caravan's MTPLM to no more than 85% of the tow car's kerbweight, rising towards 100% with experience — and it is industry guidance for stability, not a legal limit. The ratio is the caravan's MTPLM expressed as a percentage of the car's kerbweight: MTPLM ÷ kerbweight × 100. The National Caravan Council puts it plainly — "the caravan industry recommends" the figure — and explains why it matters: the ratio "has a major influence on towing stability". A caravan that is light relative to the car is the steadier outfit.

Two clubs say the same in their own words. The Camping and Caravanning Club recommends towing a caravan that weighs 85% or less of the car's kerbweight, with experienced drivers going up to 100% but never above the car's towing limit. The Caravan and Motorhome Club aims at 85% for beginners and up to 90% for experienced towers, and says never exceed 100% — so the experienced ceiling differs a little by source, but all three agree on 85% for a novice and 100% as the absolute upper bound.

The line that matters most is where the rule stands when it disagrees with the law. The NCC is direct: care must be taken not to exceed the car's loading and towing limits, including the combined MAM, "which takes preference over the weight ratios". So the ratio is a stability sanity-check that sits underneath the five legal checks, never instead of them.

How to match a caravan to your car: the worked checklist

Run the figures once, in order, and the pairing answers itself. Take an illustrative outfit (a composite, not a real registered rig): a tow car with a kerbweight of 1,900 kg, a MAM of 2,450 kg, a gross train weight of 4,200 kg, a braked towing limit of 2,000 kg and a maximum noseweight of 100 kg; matched to a caravan with an MTPLM of 1,500 kg, a MiRO of 1,250 kg (so 250 kg of payload) and a noseweight of about 90 kg.

The signature number first. The match ratio is the caravan's MTPLM over the car's kerbweight:

1,500 ÷ 1,900 = 78.9%.

That sits under the 85% novice guideline, with the 85% line for this car at 0.85 × 1,900 = 1,615 kg — so a 1,500 kg caravan has 115 kg of margin before it reaches the novice ceiling. Now the five legal checks, in order:

1. Caravan MTPLM against the braked towing limit: 1,500 ≤ 2,000 — clear, with 500 kg of headroom. This is the figure most buyers stop at; it has the most room to spare.
2. The combination rule against the gross train weight: as a strict pre-trip ceiling, car MAM 2,450 + caravan MTPLM 1,500 = 3,950 ≤ 4,200 — clear, but only 250 kg in hand. The legal test on the day is the actual loaded car plus actual loaded caravan against 4,200; if the maxed-out figures fit, the real ones will. This is the tightest legal check.
3. The car against its own MAM: kerbweight 1,900 plus the roughly 90 kg of noseweight on the towball leaves around 460 kg for driver, passengers, luggage and the towbar before the 2,450 kg MAM — comfortable for a normal load.
4. Noseweight against the lowest physical limit: 90 ≤ 100 — clear, with 10 kg in hand. At 6% of the caravan's 1,500 kg MTPLM, that 90 kg sits squarely in the recommended 5–7% loading band.
5. Your licence: a category-B licence passed from 1 January 1997 covers a trailer up to 3,500 kg MAM, and 1,500 kg is well under that.

So the ratio is 78.9% and all five legal checks hold: a sound, novice-safe match.

If you went heavier: the same car, a bigger caravan

Here is the move that catches people, kept clearly separate from the figures above — this is an illustrative "if you went heavier" variant, not the example outfit used elsewhere in this cluster. Keep the same 1,900 kg car and swap in a heavier caravan, say a larger four- or five-berth with an MTPLM of 1,700 kg. Every car figure is unchanged.

• The ratio is now 1,700 ÷ 1,900 = 89.5% — over the 85% novice guideline. A novice should not pair this; an experienced tower could, since 89.5% is still under 100%.
• The legal checks can still hold. The braked towing limit is fine: 1,700 ≤ 2,000, with 300 kg in hand. The combination rule holds too, but barely: 2,450 + 1,700 = 4,150 ≤ 4,200 — a margin of just 50 kg. On the day, a fully loaded car could tip the outfit over its gross train weight. The licence still covers 1,700 kg.

The teaching point is which limit bites first. For a novice, the 85% guideline fails at 89.5% while the braked towing limit is still satisfied — so a legal pairing can be a poor match for an inexperienced driver. And the comfortable 250 kg of gross-train-weight headroom you had at 78.9% has collapsed to 50 kg. The heavier you go, the more the easy margins vanish, even before the law says no.

Why a heavier tow car, relative to the caravan, is steadier

The point of keeping the caravan light relative to the car is stability: a heavier tow car settles the outfit and resists snaking. The Caravan and Motorhome Club puts the principle simply — the car's kerbweight should at least equal, and ideally exceed, the caravan's fully laden weight — and says the link between the weight ratio and stability has been shown through its own testing of cars and caravans, member feedback and scientific research. The ratio is not an arbitrary number; it tracks how the combination behaves at speed.

When a caravan is heavy relative to the car, weight in the wrong place can set it swinging. The Camping and Caravanning Club describes excess weight at the rear of the caravan acting like a pendulum behind the car, making the outfit unstable or causing it to snake — uncomfortable, and dangerous if it runs away from you. Noseweight feeds into the same picture: enough download on the towball steadies the outfit, which is why the noseweight check is about where the weight sits, not only how much there is. Setting and measuring noseweight is its own job — see caravan noseweight and the tow car's payload for the detail.

The clubs use kerbweight (the lightest the car realistically runs) against MTPLM (the heaviest the caravan can legally be) on purpose. It is the worst-case pairing: if the match works at the car's lightest and the caravan's heaviest, it works in between. That conservatism is the whole value of the guideline.

What can you tow on your licence?

Your licence category is one of the five checks, and for most drivers it is straightforward. A category-B (car) licence passed from 1 January 1997 lets you tow a trailer up to 3,500 kg MAM. The separate car-and-trailer (B+E) test was removed: DVSA stopped running it on 20 September 2021, and the legislative change came into force on 16 December 2021, so the entitlement now comes with a standard car licence. If you passed your car test before 1 January 1997, your entitlement is usually higher — typically a combined 8,250 kg MAM for the car and trailer together. GOV.UK is the source to confirm your own category against.

For the illustrative outfit, the caravan's 1,500 kg MTPLM is far below the 3,500 kg ceiling, so the licence check is clear for any post-1997 driver. The figure that constrains a heavier pairing is rarely the licence — it is the gross train weight or the 85% ratio that tightens first.

Check the pairing with loadmate before you commit

You have matched the outfit on paper — now the live question is whether this car and this caravan, with the real load you will actually carry, still clear all five checks and the ratio. Can I Tow It? in the loadmate app answers that. Set the region to the UK, put in the car's MAM, braked towing limit and noseweight limit, then the caravan's MTPLM and MiRO, and it runs the same five checks this guide walked through, names the one that is tightest, and reports whether the pairing is within its limits or over. The result is read from the figures you type, flagged as a spec-based estimate to plan around rather than a weighed reading. Running it is free with no account, so you can test a real pairing instead of theory; keeping your own outfit on file and tracked between trips is the loadmate Pro step.

loadmate provides decision support for towing safety, not legal weight certification. For legal weight evidence, use a certified weighbridge. Towing remains the operator's responsibility — see /safety-disclaimer. To check a pairing now, the free Can I Tow It? check lives at /tow-check.

Related guides

Start with the pillar for the weight terms, then the spokes that go deeper on each check:

• MTPLM, MiRO, MAM and payload explained — the UK caravan-weights pillar that defines every weight term this checklist uses.
• Maximum towing weight: what it does and doesn't prove — why the stated towing limit alone doesn't prove your loaded outfit is legal.
• Caravan noseweight: how to measure, set and stay legal — setting noseweight in the 5–7% band and reading the lowest-of-four physical limit (check 4).
• How to load a caravan: axle weights and noseweight — where to put the weight so the outfit stays steady once it is matched.
• How to weigh a caravan at a public weighbridge — turning the planned figures into a real loaded weight you can trust.