What Are Aluminium Tradesman Trailers Made Of?

The construction of aluminium tradesman trailers involves several distinct aluminium alloys and supplementary materials, each selected for specific properties and functions within the overall structure.

Frame and Chassis Materials:

The main chassis and structural frame typically use 6061-T6 aluminium alloy. This alloy contains magnesium and silicon as primary alloying elements and is heat-treated to the T6 temper, which provides high strength comparable to mild steel.

6061-T6 offers good weldability and machinability, making it suitable for fabricating trailer frames that must withstand torsional stresses during towing.

For heavier-duty applications, some manufacturers use 6005-T5 or 6082-T6 alloys, which offer similar properties with slight variations in extrudability and strength characteristics.

Wall and Roof Panels:

The exterior skins are commonly 5000-series aluminium alloys, particularly 5052-H32 or 5083-H32. These alloys contain magnesium as the primary alloying element and offer excellent corrosion resistance, especially in marine or road-salt environments.

These panels are typically 1.2mm to 2.0mm thick, depending on the trailer size and intended use. Thicker panels provide greater dent resistance but add weight.

Some manufacturers use ribbed or corrugated panels to increase stiffness without increasing thickness. The corrugations act as structural reinforcements, allowing thinner material to resist flexing.

Flooring Materials:

The trailer floor must support significant weight and resist wear from tools and equipment. Common materials include:

Tread plate aluminium (typically 5083 or 6061 alloy) with raised diamond or chequer plate pattern for slip resistance. Thickness ranges from 2.5mm to 4.0mm.

Extruded aluminium planks with integral ribs that interlock to form a continuous floor surface. These provide excellent strength-to-weight ratios.

Some manufacturers use marine-grade plywood coated with aluminium or protected by aluminium tread plate for weight savings and vibration damping.

Extrusions and Corner Posts:

Aluminium extrusions are used extensively for corner posts, door frames, and edge trim. These are produced by forcing heated aluminium billet through shaped dies, creating complex cross-sectional profiles.

Extrusions allow manufacturers to incorporate features such as weather seal channels, attachment points, and reinforcement ribs directly into the component shape.

Common extrusion alloys include 6063-T5 and 6061-T6, chosen for their balance of strength, corrosion resistance, and surface finish quality.

Fasteners and Joining Methods:

Welding is the primary joining method for structural components. Aluminium welding requires specific techniques (typically TIG or MIG) and filler metals matched to the base alloy.

Rivets are used extensively for attaching panels to frames. Monel or stainless steel rivets are preferred to prevent galvanic corrosion when joining aluminium to aluminium.

Bolted connections use stainless steel fasteners with anti-seize compounds to prevent galling (a form of wear caused by adhesion between sliding surfaces).

How Do Aluminium Trailers Compare to Steel Trailers?

The choice between aluminium and steel construction involves trade-offs across several performance categories. Understanding these differences helps buyers select the appropriate material for their specific needs.

Weight Implications:

The lower weight of aluminium trailers translates directly into fuel savings during towing. A lighter trailer requires less energy to accelerate and imposes less strain on the tow vehicle.

For tradespeople who frequently tow and maneuver trailers in tight spaces, the weight difference reduces physical effort during coupling and positioning.

The weight saving can be applied to increased payload capacity, allowing more tools and materials to be carried within the same gross vehicle weight rating.

Corrosion Considerations:

Aluminium's natural oxide layer provides inherent corrosion protection. If scratched, the oxide reforms rapidly, sealing the exposed surface.

In coastal environments or regions using road salt, aluminium's corrosion resistance offers significant longevity advantages over painted steel.

However, aluminium can corrode in specific conditions, particularly when in contact with dissimilar metals (galvanic corrosion) or in certain chemical environments.

How Long Do Aluminium Tradesman Trailers Typically Last?

The lifespan of an aluminium tradesman trailer depends on construction quality, usage patterns, and maintenance practices. With proper care, these trailers can provide many years of service.

Design Life Expectations:

A well-constructed aluminium trailer, used regularly but maintained properly, typically provides 15 to 25 years of service life.

Commercial-use trailers subjected to daily loading, frequent road salt exposure, and heavy loads may have shorter lifespans, often in the 10 to 15 year range.

Trailers used in marine environments or corrosive industrial settings may require more frequent inspection and earlier replacement of certain components.

Factors Affecting Longevity:

Welding quality: Poor welds can create stress concentrations and potential failure points. Professionally fabricated trailers with properly executed welds last significantly longer.

Alloy selection: Trailers constructed with marine-grade alloys (5083, 5086) for panels and structural alloys (6061-T6) for frames offer better longevity than those using lower-cost, less corrosion-resistant alloys.

Galvanic protection: Proper isolation between aluminium and dissimilar metals (such as steel suspension components) prevents accelerated corrosion at contact points.

Environmental exposure: Continuous exposure to salt spray, industrial pollutants, or harsh chemicals accelerates degradation regardless of material quality.

Maintenance Practices That Extend Life:

Regular washing to remove road salt, particularly in winter months, prevents accumulation of corrosive residues.

Periodic inspection of welds, particularly around high-stress areas such as suspension mounts and coupling points.

Application of protective coatings to the underside, such as wax-based or lanolin-based products, provides additional barrier protection.

Prompt repair of any damage, particularly cracks or dents that could allow water ingress into enclosed areas.

What Maintenance Do Aluminium Tradesman Trailers Require?

While aluminium trailers require less maintenance than steel counterparts, they are not maintenance-free. Proper care preserves appearance and structural integrity.

Routine Cleaning:

Washing with mild soap and water removes road grime and salt deposits. Pressure washing can be used but should avoid forcing water into seams and seals.

For trailers with bare aluminium finish, specialized aluminium cleaners can remove oxidation and restore appearance. These typically contain mild acids or alkaline compounds and require rinsing.

Avoid harsh chemicals such as strong alkalis (concrete cleaners) or acids (muriatic acid) that can attack the aluminium surface.

Protective Measures:

Waxing the exterior surfaces with automotive wax provides additional protection against oxidation and makes future cleaning easier.

Inspect and clean drainage holes in hollow sections and extrusions to prevent water accumulation that could bring about internal corrosion.

Check and maintain seals around doors, windows, and lighting fixtures to prevent water ingress into the trailer interior.