1. Identify the application for the Towed Bowser
The first question is simple – what liquid do you need to store and transport? The answer determines which product range you should consider.
Potable Water
A potable water bowser trailer is ideal for drinking water supply, events, welfare units or remote facilities.
Recommended models:
Animal Drinking Water
Livestock water bowsers can provide water to livestock when no mains supply is available.
Recommended models:
Non-potable / Site Water
Used for construction, dust control equipment washdown or general site water.
Recommended models:
Fuel (Diesel / Gasoil)
A fuel bowser trailer is designed for applications such as for plant refuelling, generators, vehicle fleets and remote machinery.
Recommended models:
AdBlue (DEF)
For modern engines that require DEF for emissions compliance.
Recommended models:
- 950L Bunded AdBlue Road Tow Bowser
- 950L Bunded AdBlue Site Tow Bowser
Pressure Washing / Dust Suppression
For high-pressure cleaning, welfare servicing or dust-control tasks.
Recommended models:
2. Choose the required capacity
The next question is to decide how much liquid you will need to store or transport at one time.
200-600 Litres
Ideal for portable set ups and welfare applications. Example products include the Compact Site Tow Mini Water Bowsers and Wash Bowsers.
1000 -1200 Litres (Most popular range)
Common across construction, utilities and events. Available for water, fuel and AdBlue. Models include;
- 1100L Potable / Non-potable Bowser
- 950L Bunded Fuel or AdBlue Bowser
2000 Litres +
Best for high-demand operations and remote work. Models include;
- 2000L Road Tow Water Bowser
- 2000L Site Tow Water Bowser
- 2000L Bunded Fuel Bowser
3. Decide on transport requirements
Where will the bowser be used – public highways or private/off-road sites? A bowser for private site use is referred to as a site tow bowser. Bowsers for public road are referred to as Highway Bowsers. Each option has different requirements, therefore we have created an easy to read comparison table below for your reference.
Feature
|
Road Tow Bowser
|
Site Tow Bowser
|
| Where It Can Be Used |
Public highways & private sites |
Off-road sites only (construction, agriculture, quarries) |
| Legal Requirements |
Must be highway-approved with lighting board, brakes & compliant chassis |
No highway approval required |
| Chassis Type |
Type-approved road tow chassis |
Heavy-duty off-road chassis |
| Best For |
Transport between sites, events, welfare, utilities |
Rough terrain, construction sites, farm tracks |
| Tyres |
Standard road tyres |
Large flotation / off-road tyres |
| Typical Capacities |
950L – 2000L |
300L – 2000L |
| Cost |
Higher (due to road-legal components) |
Lower |
| Examples |
1100L Road Tow Water Bowser, 950L Bunded Road Tow Fuel Bowser |
1100L Site Tow Water Bowser, 950L Site Tow Fuel Bowser |
4. Single-axle or Twin-axle Trailer?
The larger bowser sizes (1125 Litres plus) are available in either single axle or twin axle options.
A single-trailer has one axle and one set of wheels while a dual-axle trailer has two axles with two sets of wheels.
Single-axle or Twin-axle Towed Bowser Comparison Table
Feature
|
Single Axle
|
Twin Axle (Dual Axle)
|
| Number of Axles/Wheels |
1 axle / 2 wheels |
2 axles / 4 wheels |
| Stability |
Suitable for lighter loads; less stable on rough ground |
Excellent stability, especially with heavier loads |
| Load Distribution |
All weight on one axle |
Weight spread across both axles |
| Towing Ease |
Easier to manoeuvre in tight spaces |
More stable when towing at speed |
| Terrain Performance |
Less capable on uneven or soft ground |
Handles rough terrain more safely |
| Maintenance |
Cheaper, fewer components |
Higher cost, more components |
| Best For |
Budget-friendly, smaller bowsers |
Heavy loads, longer distances, safer handling |
| Typical Sizes |
Up to ~1125L |
1125L – 2000L+ |
Single axle for lighter more budget friendly towing. Dual axle for when you have heavy loads and need greater stability.
5. Regulatory & Safety Requirements of Trailed Bowsers
Ensuring compliance is essential – especially for fuel, potable water and ADR transport. As a consequence, a few consideration for each fuel type can be found below.
Fuel & AdBlue (Mandatory)
- Always select a bunded tank (110% capacity).
Drinking water
- Requires potable-grade tanks.
- WRAS-approved materials
ADR Transport
Operations covered by ADR regulations must choose an ADR-approved variant. Available for Fuel and AdBlue. You can find out more about ADR regulations here.
6. Tow Hitch Option
Towed bowsers come with the option of a 50mm ball hitch or a 2″ ring eye. Ensure your towing vehicle is compatible with the hitch supplied. Most road-tow bowsers use a 50mm ball hitch while site-tow units often use a ring hitch for durability on rough terrain.
7. Select the dispensing method
How will the stored liquid be used on site?
Gravity Feed
- Simple, low-maintenance
- Suitable for potable and non-potable water
Hand Pump
- Basic transfer for water or fuel
- Available on 950L Fuel Bowsers and Site Tow Water Bowsers
12V / 24V Electric Pump
- Fleet refuelling
- Mobile power units and generators
- Standard on bunded fuel and AdBlue bowsers
Engine-Driven Pump
- High-flow output for washdown
- Fits 1100L Wash Bowser
High-pressure Washer System
- Ideal for plant/equipment cleaning
- 1100L Pressure Wash Bowser
Spray Bar / Dust Suppression
- Ideal for haul roads, demolition, construction
- Dust suppression Bowser with spray bar available.
8. Consider Environmental & Durability Conditions
Select features for the Trailed Bowser based on your working environment.
Harsh Construction Sites
Recommended:
- Heavy-duty Site Tow chassis
- Steel mudguards
- Heavy wheels/axles
Highway Transport
- Road Tow, Type Approved Chassis
Remote Operations
Consider:
- Larger capacities (2000L +)
- Engine-driven pump options
Cold Weather
- Frost protection systems
- Optional insulation
9. Custom Towed Bowsers
Working with the leaders in trailer and bowser manufacturing in the UK, we can create a bespoke product to meet a specific need. Get in touch with our friendly customer services team who will be able to take a few details and offer a quotation.
10. Summary
Choosing the right towed bowser is vital for safe, compliant and efficient liquid transport – whether you’re handling drinking water, diesel, AdBlue or dust-suppression systems. With options ranging from compact site-tow units to heavy-duty highway-approved trailers, the selection process can feel overwhelming. This guide breaks everything down clearly so you can quickly identify the best bowser for your site conditions, capacity requirements and operational demands.
Because we partner with the top UK manufacturers, every bowser we supply is built to last and meets all relevant safety and compliance standards. If you’d like tailored advice or help selecting the perfect unit, our friendly team is ready to assist. Simply get in touch through our Contact Us page.
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