Best Vehicle-Mounted Water Tanks for Australian Overlanding
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When you are tackling the harsh Australian outback, a reliable water supply is not just a luxury—it is a necessity. Whether you are planning a weekend camping trip or a month-long overlanding expedition, having a durable vehicle-mounted water tank ensures you stay hydrated, clean, and prepared for any situation. In this guide, we break down what to look for in a 4×4 water tank and highlight the different types available to suit your touring setup.
Why You Need a Vehicle-Mounted Water Tank
Carrying loose water jerry cans inside your vehicle takes up valuable cargo space and can be a safety hazard if not secured properly. A vehicle-mounted water tank solves this by utilizing dead space—such as under the tray, behind the rear seats, or on the roof rack. This keeps the weight low and distributed evenly, improving your 4WD’s handling on corrugated tracks.
Key Buying Criteria for Australian Conditions
Before investing in a water tank for your 4×4, consider these essential factors to ensure it meets the demands of Australian overlanding:
- Material Durability: Look for food-grade, BPA-free polyethylene (poly) or high-grade aluminum. Poly tanks are lightweight and resistant to cracking, while aluminum tanks offer rugged durability but can be heavier.
- Capacity: Assess your water needs based on the number of travelers and the duration of your trips. A 20L to 40L tank is sufficient for weekend getaways, while extended remote touring may require 60L to 100L+ setups.
- Mounting Location: Choose a tank designed for your specific vehicle and setup. Options include under-tray tanks, footwell tanks, roof-mounted tubes, and upright tanks that sit behind the rear seats or cargo barrier.
- Baffling: For larger tanks (over 40L), internal baffles are crucial. They prevent water from sloshing around, which can negatively affect vehicle stability and cause annoying noise while driving.
- Plumbing and Access: Ensure the tank has accessible fill points and secure outlets. Consider whether you need a simple gravity-fed tap or a 12V pressurized pump system for showers and washing up.
Types of 4×4 Water Tanks
There is no one-size-fits-all solution when it comes to water storage. Here are the most common types of vehicle-mounted water tanks to consider for your build:
1. Under-Tray and Under-Body Tanks
Ideal for dual-cab utes and vehicles with custom trays, these tanks utilize the empty space underneath the vehicle. They keep the center of gravity low and free up valuable space in the canopy or tub. Ensure they are fitted with robust bash plates to protect against rocks and debris.
2. Upright and Footwell Tanks
Upright tanks are designed to sit flush against a cargo barrier or behind the rear seats in wagons. Footwell tanks fit snugly into the rear passenger footwells, making excellent use of otherwise wasted space. These are great options for families or solo travelers who do not need the rear seats.
3. Roof-Mounted and Pressurized Shower Tubes
Roof-mounted tanks, often in the form of PVC or aluminum tubes, are popular for storing water specifically for showering or washing gear. Many of these can be pressurized using a 12V air compressor or a manual hand pump, providing a steady stream of water wherever you park.
4. Flexible Water Bladders
If you have limited permanent mounting space, a heavy-duty water bladder is a versatile alternative. They can be placed in footwells or on top of drawer systems and simply fold away when empty. Look for reinforced, puncture-resistant materials.
Comparison of Water Tank Materials
| Material | Pros | Cons | Best For |
|---|---|---|---|
| Polyethylene (Poly) | Lightweight, rust-proof, impact-resistant, affordable. | Can degrade under prolonged UV exposure if not protected. | Under-body, upright, and general touring setups. |
| Aluminum / Stainless Steel | Extremely durable, UV resistant, customizable shapes. | Heavier, more expensive, potential for corrosion if not treated. | Custom tray builds, under-tray mounting. |
| Flexible PVC / TPU (Bladders) | Space-saving, conforms to odd shapes, easy to store when empty. | Prone to punctures, harder to clean, can affect water taste initially. | Temporary storage, footwells, occasional use. |
Integrating Your Water System
Once you have selected the right tank, consider how it fits into your broader 4x4/Overlanding/Touring setup. A well-planned water system often pairs with a 12V water pump, inline filters, and quick-connect fittings for hoses and showerheads. If you are building a comprehensive 12V system, check out our guides in the 4x4/Overlanding/Touring section to ensure your auxiliary battery can handle the extra load of a water pump.
For those who enjoy casting a line, having a dedicated tap for washing hands and cleaning gear is a game-changer. Explore our Fishing Gear recommendations to complete your coastal touring setup.
Equipping your 4WD with a reliable water tank is one of the best investments you can make for remote travel. By choosing the right capacity, material, and mounting location, you will ensure a safe and comfortable journey across the Australian outback.