Single Axle vs Tandem Axle Suspension - Which Is Best for Your Trailer?

Choosing the right trailer suspension setup isn't just about load capacity - it affects how your trailer tows, tracks, handles bumps, and wears over time. The decision between single axle and tandem axle spring kits often comes down to a balance of weight, usage, and cost.

Here's how the two setups compare - and how to know which one is best for your trailer project.

What Is a Single Axle Suspension?

A single axle trailer uses one axle and two wheels, supported by a spring kit designed for your GVM (Gross Vehicle Mass). Treadway offers tailer spring kits ranging from 500kg to 2000kg for single axle use.

Advantages:

  • Lower cost to build and maintain

  • Easier to manoeuvre and reverse

  • Less weight = better fuel efficiency

  • Fewer tyres, brakes, and bearings to maintain

Best suited for:

  • Light commercial trailers

  • Domestic or recreational use

  • Farm trailers and utility builds

If your GVM is 1500kg or less, a single axle setup is often the simplest and most economical option.

What Is a Tandem Axle Suspension?

Tandem axle trailers have two axles and four wheels, with load distributed across both axles. This typically requires a tandem axle spring kit with equaliser hangers and added hardware.

Advantages:

  • Better load distribution and stability

  • Higher load ratings (up to 3500kg GVM)

  • Smoother ride on rough roads

  • More safety margin for long-distance towing

Best suited for:

  • Equipment or digger trailers

  • Boat trailers

  • Heavy farm and trade trailers

  • Regular long-distance or highway towing

Treadway's tandem axle kits range from 1250kg to 3500kg capacity and include all the hardware you need.

Key Considerations When Choosing

Feature Single Axle Tandem Axle
Max load Up to ~2000kg Up to ~3500kg
Ride comfort Basic Smoother
Handling if tyre fails Riskier More stable
Maneuverability Easier Harder in tight spaces
Maintenance costs Lower Higher (more tyres, brakes, bearings)
Best for Light trailers, occasional use Heavy loads, longer distances

Final Thoughts: What's Best for You?

If you're towing lighter loads or need something easy to manoeuvre around town or the farm, a single axle trail spring kit is likely your best bet.

But if you're hauling heavy gear, covering long distances, or prioritising stability and safety, a tandem axle kit is a better long-term investment.

Need help deciding? Browse our single axle kits or tandem axle kits, or talk to our team for expert guidance.