What to Ask Before Buying a Caravan

Introduction

Buying a caravan is a significant investment, and the weight figures on the compliance plate determine whether it will work with your tow vehicle. Asking the right questions before purchase helps you avoid discovering a mismatch after you have already committed.

This guide covers the practical questions to ask a dealer, manufacturer or private seller — and why each answer matters for your towing setup.

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1. Compliance Plate and Placard Figures

Every caravan sold in Australia must have a compliance plate showing key weight ratings. These are the legal maximums for the caravan — not estimates or targets.

**Ask to see the compliance plate and note:**

**Why it matters:** Compare actual loaded trailer mass and coupling download with the applicable vehicle and equipment limits and manufacturer conditions. A rated-maxima comparison cannot establish the actual load. Plated ATM minus GTM does not give today's coupling measurement.

**Checklist:**

• Ask to see the compliance plate in person — do not rely on brochure figures alone
• Photograph the plate for your records
• Confirm the ATM matches or is below your vehicle's tow rating
• Measure the loaded coupling download for the intended loading condition
• Confirm the towball mass is within your vehicle's towball download limit

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2. Tare Versus Actual Delivery Weight

The tare weight on the compliance plate is measured under specific conditions — typically with empty water tanks, no gas, no personal gear and no fitted accessories beyond what was included at manufacture.

The actual weight of the caravan when you take delivery may be higher because of:

• Dealer-fitted options (air conditioning, solar panels, awnings, extra batteries)
• Gas bottles filled
• Water in tanks
• Aftermarket accessories fitted before delivery

**Ask the dealer:**

• "What will this caravan actually weigh when I take delivery?"
• "What options are fitted that add weight beyond the compliance plate tare?"
• "Can you provide a weighbridge ticket showing the as-delivered weight?"

**Why it matters:** If the as-delivered weight is significantly higher than the compliance plate tare, your available payload (ATM minus actual weight) is smaller than you might think. This affects how much gear, water and food you can legally carry.

**Checklist:**

• Ask for the as-delivered weight, not just the compliance plate tare
• List all factory and dealer-fitted options and their approximate weight
• Calculate your remaining payload: ATM minus actual delivered weight
• Consider whether the remaining payload is sufficient for your intended use

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3. ATM, GTM and Towball Mass

Understanding the relationship between these three figures is essential for matching the caravan to your tow vehicle.

**Ask:**

• "What is the rated ATM and GTM for this specific model and variant?"
• "What is the expected towball mass when the van is loaded to ATM?"
• "Does the towball mass change significantly if the van is loaded lightly versus fully?"

**Why it matters:** The towball mass is the weight that transfers to your tow vehicle and counts against its GVM, payload and rear axle rating. If the towball mass is high (which is common for heavier caravans), it may exceed your vehicle's towball download limit or consume too much payload.

**Checklist:**

• Note the ATM and GTM from the compliance plate
• Ask for the manufacturer's specified maximum-load coupling figure and obtain an actual loaded coupling measurement
• Compare the towball mass to your vehicle's towball download limit
• Compare the towball mass to your vehicle's remaining payload after accessories and passengers

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4. Payload and Loading Capacity

The caravan's payload is the weight you can add before reaching ATM: Payload = ATM minus Tare Weight.

**Ask:**

• "What is the available payload (ATM minus actual delivered weight)?"
• "How much does a full water tank add to the weight?"
• "Where are the water tanks located relative to the axles?"
• "What is the maximum roof load rating?"

**Why it matters:** A caravan with a small payload may not have enough capacity for water, food, clothing, camping gear and accessories. Water alone weighs 1kg per litre — a 200-litre tank adds 200kg when full. If the available payload is only 400kg, a full water tank consumes half of it.

**Checklist:**

• Calculate available payload: ATM minus actual delivered weight
• List what you plan to carry: water, food, clothing, gear, accessories
• Estimate water weight at 1kg per litre
• Check whether the remaining payload is realistic for your intended trips

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5. Loading Plan and Weight Distribution

How you load the caravan affects towball mass, axle loads and towing stability. Heavy items placed at the rear reduce towball mass (potentially causing sway); heavy items at the front increase it (potentially overloading the tow vehicle's rear axle).

**Ask:**

• "Where are the water tanks, batteries and gas bottles located relative to the axles?"
• "Is there guidance on loading distribution for this model?"
• "What is the recommended towball mass range for stable towing?"

**Why it matters:** A caravan with water tanks at the rear may have a very different towball mass when the tanks are full versus empty. Understanding the load distribution helps you pack for stable, compliant towing.

**Checklist:**

• Note the location of heavy fixed items (tanks, batteries, gas bottles)
• Ask for loading guidance from the manufacturer or dealer
• Plan to keep heavy items low and near the axle
• Understand that rear-loaded weight reduces towball mass and may cause instability

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6. Weighbridge Verification

Establish actual caravan mass by weighing it in the relevant empty or loaded condition using an appropriate weighbridge or calibrated scales. Estimates and brochure figures may differ from the actual setup; weighing does not establish its permitted ratings.

**Ask:**

• "Can you provide a weighbridge ticket for this specific caravan as delivered?"
• "Has this van been weighed, or are the figures from the compliance plate only?"
• "Is there a public weighbridge nearby where I can verify the weight after purchase?"

**Why it matters:** A weighbridge ticket gives you the actual weight of the caravan, not the theoretical figure. This is the only reliable starting point for payload calculations and for confirming the combination is within your tow vehicle's limits.

**Checklist:**

• Request a weighbridge ticket showing the as-delivered weight
• If not available, plan to weigh the caravan yourself before loading it
• Weigh the caravan again after loading for a trip — loaded weight is what matters for compliance
• Record axle weights if possible, not just total weight

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Questions to Ask Before You Commit

Bring this checklist when inspecting a caravan:

**Compliance plate:**

• Can I see the compliance plate? (Photograph it)
• What is the ATM, GTM and rated towball mass?
• What is the tare weight on the plate?

**Actual weight:**

• What will the caravan actually weigh when I take delivery?
• What options are fitted that add weight?
• Can you provide a weighbridge ticket?

**Tow vehicle match:**

• Does the ATM exceed my vehicle's tow rating?
• Does the towball mass exceed my vehicle's towball download limit?
• Does the towball mass fit within my vehicle's remaining payload?

**Loading:**

• What is the available payload (ATM minus actual delivered weight)?
• Where are the water tanks located?
• What is the recommended loading distribution?

**After purchase:**

• Where is the nearest public weighbridge?
• When should I weigh the caravan loaded?

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