The 85% Rule: Helpful Guide or Misleading Myth?

Few things in caravanning spark as much debate as the 85% rule.

Some people swear by it.
Others dismiss it entirely.
And many newcomers are left wondering whether they’re breaking some unwritten law.

So what is the 85% rule really — a helpful guide, or a misleading myth?

The honest answer is: it can be either, depending on how you understand it.

Let’s clear it up calmly.

What Is the 85% Rule?

The 85% rule suggests that:

A caravan’s fully loaded weight should not exceed 85% of the tow car’s kerbweight.

That’s it.
No legislation.
No enforcement.
No fines attached.

It’s not a legal requirement — it’s a guideline that’s been passed around caravanning circles for years.

Where Did It Come From?

The 85% rule didn’t come from lawmakers or manufacturers.

It emerged as a rule of thumb, designed to:

• Encourage margin

• Discourage mismatched outfits

• Help newcomers avoid stressful first experiences

In short:

It was created to build confidence, not compliance.

Why Some People Find It Helpful

For newer caravanners, the 85% rule can:

• Act as a confidence buffer

• Reduce anxiety on early trips

• Encourage lighter loading

• Promote forgiving handling

If you’re new to towing, staying well within limits often:

• Feels calmer

• Feels more predictable

• Makes learning easier

Used this way, the 85% rule can be a useful training wheel, not a rigid rule.

Why Others Say It’s a Myth

The criticism usually comes from experienced caravanners — and they’re not wrong either.

The 85% rule:

• Isn’t legally recognised

• Doesn’t account for modern vehicle design

• Ignores suspension, torque, wheelbase and braking

• Can oversimplify complex setups

Two outfits at the same percentage can feel very different on the road.

That’s why many people eventually outgrow it.

The Big Misunderstanding

The problem isn’t the 85% guideline itself.

The problem is when it’s treated as:

• A legal limit

• A universal truth

• A pass/fail test

When people say:

“You must stick to 85%”

That’s when it becomes misleading.

Legal Reality vs Practical Reality

Here’s the important distinction:

• Legal limits are defined by law and manufacturer ratings

• The 85% rule is neither

You can be:

• Above 85%

• Completely legal

• Correctly insured

At the same time, you can be:

• Below 85%

• Legal

• And still poorly loaded or uncomfortable

Percentages don’t replace good loading or good judgement.

Experience Changes the Equation

What feels sensible evolves with:

• Experience

• Familiarity with your vehicle

• Journey length

• Conditions

A newcomer might find 80–85% reassuring.
A seasoned caravanner might tow happily above that — still legally, still sensibly.

Neither approach is automatically right or wrong.

When the 85% Rule Helps Most

It tends to be useful when:

• You’re new to towing

• You want reassurance

• You’re comparing potential outfits

• You’re trying to build confidence gradually

It’s less useful when:

• Treated as law

• Used to judge others

• Applied without understanding loading, balance and noseweight

A Better Way to Think About It

Instead of asking:

“Am I under 85%?”

A more helpful question is:

“Do I have enough margin for this setup, this journey, and my experience?”

That shift alone removes a lot of stress.

The Calm Truth

The 85% rule isn’t dangerous — misunderstanding it is.

Used sensibly, it:

• Encourages margin

• Builds confidence

• Reduces early anxiety

Used rigidly, it:

• Creates unnecessary fear

• Sparks arguments

• Distracts from what really matters

Where to Go Next

If this page helped, these complete the picture:

• Caravan Weights Explained (Without the Confusion)

• MTPLM vs MIRO vs Payload (Plain English)

• Legal Limits vs Sensible Limits When Towing

• Noseweight Explained (What Actually Matters)

Together, they replace rules-of-thumb with understanding.

Final Thought

You don’t need to chase a percentage to tow safely.

You need:

• Legal compliance

• Sensible margins

• A setup that feels calm and predictable

The 85% rule can be a starting point — but it should never be the destination.