The 7 most common safety mistakes when converting a campervan

Every year, thousands of enthusiasts transform old vans into rolling dream homes – but according to the ADAC (German Automobile Club), 231,300 of these self-conversion projects end with dangerous safety defects during the initial vehicle inspection. At the 2025 Self-Conversion Fair in Stuttgart (January 22-25), experts will show you which critical mistakes you should avoid from the start.

DIY campervan conversions are booming: In Germany alone, over 47,000 vans were converted into campervans in 2024. But between Instagram dreams and the reality of the road, there are often serious safety gaps. We uncover the seven most common mistakes – and show you how to avoid them.

Mistake 1: Ignoring tire pressure after weight changes

By far the most dangerous mistake: After installing furniture, water tanks, and solar panels, the axle load distribution changes dramatically – yet 68% of all self-builders fail to adjust the tire pressure. The result: overheating, increased wear, and in extreme cases, tire blowouts while driving on the highway.

The solution: A professional tire pressure monitoring system like the TireMoni TM-240R continuously monitors the pressure and temperature of all tires. Real-time monitoring is essential, especially with changing loads (full water tanks vs. empty tanks). The system immediately warns you of critical deviations – long before it becomes dangerous.

Error 2: Incorrect tire approval for the new total weight

Many DIY van builders massively underestimate the final vehicle weight. An empty Sprinter weighs 2.5 tons – after conversion, often 3.8 tons. If the original tires are reused, the necessary load-bearing capacity is lost. Particularly critical: After the conversion, the rear axle often carries 400-600 kg more than intended by the manufacturer.

Practical tip: Weigh your vehicle axle by axle after removal and choose tires with a sufficient load index. Combine this with a TPMS that also detects overload situations – this way you stay on the safe side.

Error 3: No pressure control during trailer operation

Are you planning to use a trailer or bike rack? 411 of the self-converted motorhomes regularly tow a trailer – but only 121 monitor its tire pressure. Especially on long holiday trips with a fully loaded trailer, extreme stresses occur.

The TireMoni system can easily be expanded to cover up to 22 tires – perfect for motorhomes with trailers or caravan combinations. Installation takes less than 30 minutes and requires no special tools.

Mistake 4: Failure to consider seasonal changes

Your self-converted campervan will likely be used year-round – from summer trips to Croatia to winter camping in the Alps. Temperature differences of 60°C between summer and winter significantly affect tire pressure: For every 10°C temperature change, the pressure changes by approximately 0.1 bar.

The smart solution: Modern TPMS systems automatically compensate for temperature fluctuations and only warn of truly critical pressure losses – not of normal seasonal fluctuations.

Mistake 5: Cheap sensors without long-term reliability

Online marketplaces advertise TPMS systems for as little as €49 – but in the harsh realities of everyday use, these often fail after just a few months. Corrosion, battery damage, and signal loss are typical problems. Skimping on a €15,000 DIY conversion project can prove costly.

TireMoni has relied on Swiss quality standards since 2005: robust, weatherproof sensors with up to 7 years of battery life (internal sensors) or 2 years for external sensors. ADAC test winner and TÜV-certified – reliability you can count on.

Error 6: Installation without expertise

""I'll manage that" – a phrase that often proves costly when converting a van yourself. Incorrectly mounted sensors lead to false alarms, signal loss, or even valve damage. Correct positioning is particularly crucial with dual tires (common in 3.5-ton conversions).

Our tip for trade fair visitors: Take advantage of the 2025 DIY vehicle conversion trade fair for a live demo and have the installation explained to you by TireMoni experts. The detailed instructions and support make installation safe and feasible even for beginners.

Error 7: No monitoring system for long-haul flights

Most tire damage doesn't occur suddenly, but gradually over hours. A slow leak, a faulty valve, or an imbalance – without continuous monitoring, you won't notice the problem until it's too late. This can become life-threatening, especially on highways and mountain passes.

A reliable TPMS like TireMoni gives you constant control: The clear display shows you all tire values at a glance. Multi-level alarms warn you early – both audibly and visually. This allows you to react in time before a small problem becomes a major issue.

Safe travels from the very first journey

Converting your van yourself is a fascinating project – but safety should never be compromised. With the right preparation, professional components, and a reliable tire pressure monitoring system, you can transform your van not just into a dream camper, but into a safe home on wheels.

Visit TireMoni at the DIY Campervan Conversion Fair 2025 (January 22-25, exhibition center). Our experts will provide you with individual advice on your conversion project and show you which system is best suited to your vehicle.

Get informed now and get off to a safe start: TireMoni for motorhomes & caravans | product overview