How much does it cost to use a weighbridge?

Usually a modest fee per weigh, and prices vary by operator. Ask for a printed ticket for each reading so you have a record.

How often should I weigh my caravan?

After buying it, after adding accessories or changing how you pack, and before any big trip. Vans tend to get heavier over time.

Is the tow-ball mass always 10% of my van's weight?

No. Around 10% of the loaded van's weight is a common guide, but the right figure is what the van maker specifies and your vehicle and tow bar allow. Measure it rather than assume it.

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How to Weigh Your Caravan at a Weighbridge

To weigh a caravan, load everything as you travel and take four weighbridge readings: the whole rig, the van's axles while hitched (GTM), the van alone (ATM) and the tow vehicle alone. Tow-ball mass is the van alone minus its hitched axle reading.