GWM Cannon Tray and Canopy Dimensions: Exact Measurements for a Perfect Aluminium Fitment

Ordering a canopy or tray cover without first confirming exact measurements is the single most common fitment mistake GWM Cannon owners make. The consequences range from minor clearance issues to completely incompatible accessories that cannot be returned once modified. If you are working through that process now, this reference article is built specifically for you.

The GWM Cannon range spans multiple configurations, including the standard dual-cab utility, the Cannon Alpha, and cab chassis variants, each with dimensional differences that matter when specifying aftermarket accessories. GWM Cannon tray dimensions are not universally consistent across the lineup, and assuming they are will cost you time and money.

This article publishes verified tub measurements, rail positions, tie-down point locations, and clearance envelope data for each major Cannon variant. You will also find a practical cross-check methodology to compare these figures directly against any canopy or tray cover product specification sheet before you commit to a purchase. The sections that follow cover everything from variant-specific length and width data through to common fitment errors and how to avoid them systematically.

GWM Cannon Tray Dimensions by Variant

The GWM Cannon range spans four distinct configurations: dual-cab utility, single-cab cab chassis, dual-cab cab chassis, and the Cannon Alpha. Each carries potentially different tray dimensions and none can be assumed interchangeable for canopy or tray cover fitment purposes.

Industry sources including CarsGuide and CarExpert confirm that tray size is a documented differentiator across the dual-cab ute segment. Before ordering any accessory, verify your variant's figures against published data rather than relying on generically listed "GWM Cannon" dimensions.

For each variant, the following measurements must be confirmed independently:

Variant misidentification is a reliable precursor to fitment error. Even a small variance in internal width at the wheel arches between variants can prevent a canopy mounting system from seating flush, confirm your exact variant's figures before ordering.

For owners investigating an aluminium tub canopy for the GWM Cannon, confirming your specific variant's figures against the product's listed mounting dimensions is the essential first step. Subsequent sections break down each configuration in detail.

Dual-Cab Utility (Standard Cannon)

The baseline reference for GWM Cannon fitment is the standard dual-cab utility, as most aftermarket canopy and tray cover products are engineered around this configuration.

Internal tray length is the primary fore-aft fitment dimension. Measure at floor level, from the front bulkhead face to the tailgate inner face when closed. Rail-height measurements return a different figure due to bulkhead and tailgate taper, and using that number can result in a canopy that sits proud or fails to seal at the front face.

Internal width requires two separate measurements, opening width at rail height and usable floor width, which is narrower due to wheel arch intrusion. Wheel arch intrusion reduces usable floor width below rail-height width, confirm the exact differential on your build. A supplier quoting a single internal width figure without specifying measurement height is not giving you the data you need.

Deck height from ground affects step-up ergonomics and load floor alignment. For a through-loading configuration, the canopy floor must align with the Cannon's cabin load sill, and deck height is the starting point for that calculation. It also determines total installed canopy height, relevant when sizing an aluminium roof platform for the GWM Cannon above a canopy body.

Manufacturer-Published Baseline (verify against your build)

GWM's own documentation lists the standard Cannon cargo area at 1,520mm (length) × 1,520mm (width) × 538mm (height) as a manufacturer's baseline. Deck height, side wall height, and external width are not published in consumer-facing sources, obtain these from GWM's official specification sheet or measure your specific vehicle before ordering.

Cannon Alpha Tray Dimensions

As established above, the Alpha must be measured independently. The Alpha sits on a longer wheelbase (3,350mm overall) and a broader body footprint than the standard Cannon utility, differences that flow directly into tray geometry and mounting point positions.

Tray length is the first verification point. Even a modest variance in internal tray length between the Alpha and the standard Cannon is sufficient to prevent a canopy from seating correctly, confirm Alpha dimensions independently from GWM's specification sheet. That margin is smaller than most owners expect, and it is invisible until the canopy is already on the tray.

Wheel arch profiles require separate verification. Wheel arch intrusion into the tray floor may sit at a different lateral position or depth on the Alpha. This affects internal usable width at floor level and determines whether drawer systems or modular storage frames will clear without modification.

Owners in this bracket are typically specifying premium aluminium canopies, modular storage, or roof platform solutions built for the GWM Cannon, where a fitment error carries proportionally higher financial consequences.

Any Cannon Alpha specification table must also identify the body style measured. Utility and cab chassis configurations present fundamentally different tray structures; measurements taken from one cannot be applied to the other.

Cab Chassis Variants

The cab chassis configuration sits in a different fitment category entirely. Unlike the utility variants discussed above, GWM Cannon cab chassis models are typically supplied without a factory tray, confirm with your dealer. There are no factory tray dimensions to reference because there is no factory tray. The tray is entirely defined by whoever builds and fits it.

This shifts the critical reference measurements to the chassis itself. The specifications that matter for a cab chassis fitment are:

• Chassis rail width (outside face to outside face)

• Chassis rail height from ground

• Overhang length behind the rear of the cab

• Body mounting point positions along the rail

These four measurements define what any aftermarket tray builder must match. Without them confirmed, no tray template can be validated.

Rail spacing can differ between single-cab and dual-cab cab chassis builds. Owners must verify that the tray builder's GWM Cannon template was developed for their specific configuration, not assumed to be universal across cab types. A template built for the dual-cab cab chassis may not correctly align on a single-cab variant.

Once the tray is installed, canopy fitment must be verified against the tray, not against the vehicle. Factory specs become irrelevant at that point. The canopy supplier needs the tray's rail dimensions and profile, not GWM's specification sheet.

The most reliable approach is sourcing both the tray and canopy from a single supplier holding verified GWM Cannon cab chassis templates. Mixing tray and canopy products from separate manufacturers compounds compatibility risk at every joint in the build.

Rail Positions, Tie-Down Points, and Canopy Mounting Reference

Once the tray body or aftermarket tray is confirmed, attention shifts to the rail structure, where canopy fitment is actually made or broken.

Side rail height is the first measurement to confirm. Aluminium canopies rely on a minimum rail height for mounting clamps to achieve full mechanical engagement. Too shallow a rail and the clamp either bottoms out before reaching torque, or over-compresses the perimeter seal, compromising the weatherproof interface. Verify the GWM Cannon's side rail height against your chosen canopy supplier's minimum clamp insertion depth before ordering.

Lateral rail spacing (inside edge to inside edge at the top of the rail) is the critical width figure for canopy compatibility. This dimension is consistently narrower than the internal tray floor width because rail wall thickness and any protective capping reduce the usable span. Do not substitute one for the other when cross-referencing a canopy's listed mounting width.

Rail cross-section data (height, wall thickness, cap width) matters wherever a clamping system applies torque directly to the rail. Undersized wall thickness is a deformation risk on corrugated tracks, and slippage under load is a real outcome when clamp geometry does not match the rail profile.

Tie-down anchor positions govern where cross-bar systems, roof platforms, and canopy floor-mounting brackets can be located. Stake pocket spacing and load ratings are fixed points; any bracket system must align with them rather than assume adjustable positioning.

For aftermarket rail accessories including systems like Rhino Track, verify compatibility against the Cannon's actual rail profile. Not all ute rails accept universal accessories without a purpose-made adapter. A product compatible with an aluminium tub canopy setup designed for the Ford Ranger will not necessarily transfer across to the Cannon's rail geometry without verification.

Clearance and Fitment Envelope Data

Beyond rail compatibility, the fitment envelope extends vertically, where compliance and real-world practicality intersect.

Australia's national general access height limit sits at 4.3m, but that ceiling is largely irrelevant for ute owners. Multi-storey car parks commonly restrict entry to as low as 2.0m, and ferry vehicle decks impose their own restrictions, check before travel. Many covered camping areas impose similar limits. The number that matters is your combined vehicle-plus-canopy height, calculated before purchase, not after.

That calculation starts with the GWM Cannon's tray deck height from ground level. This baseline shifts with any suspension lift or tyre size increase, so confirm the measurement on your actual setup. A suspension lift combined with larger-diameter tyres adds meaningful height, measure your actual setup.

Different canopy types add very different profiles above the tray rail:

• Hard-top aluminium canopies add significant height above the tray rail, confirm the figure with your specific canopy supplier.

• Modular canopies vary by configuration but generally fall within a similar range

• Roller covers add minimal height but alter the effective tray access envelope rather than overall vehicle height

Aluminium canopies carry meaningful payload weight, obtain the specification from your canopy supplier before calculating GVM headroom.

For owners adding a roof platform, the full height stack, deck height plus canopy body plus platform rail height plus any mounted gear, must be calculated as a single figure against both road transport limits and practical daily clearances.

Common Fitment Mistakes and How to Avoid Them

Getting the clearance envelope right matters, but even accurate height calculations won't save a fitment if the foundational measurements are wrong. These are the five errors that cause the most returns and remounts on GWM Cannon canopy installations.

Measuring external width instead of internal width at the wheel arches. A canopy supplier's listed internal width is the usable floor space, always narrower than the tray's external dimension. Wall thickness, rail caps, and wheel arch intrusion collectively reduce that figure. Measure at wheel arch height, not at the rail opening, and not from the outside of the tray walls.

Variant misidentification between the standard Cannon and the Cannon Alpha. Overall tray length may appear similar across variants, but mounting geometry and rail positioning can differ enough to cause a misfit, confirm your exact variant before cross-referencing any canopy specification sheet.

Ignoring existing tray liner thickness. A spray-on liner fitted as standard on many 2024 Cannon models, or a drop-in liner added post-delivery, reduces both internal width and length by the liner's thickness on every face. A canopy with tight tolerances will seat incorrectly if liner thickness is not deducted from your measurements first.

Trusting "universal fit" listings without verification. Universal fit claims are commercial descriptions, not dimensional guarantees. Always cross-reference the supplier's mounting dimensions against the verified vehicle-specific figures in this reference before ordering any GWM Cannon tray canopy product.

Overlooking the front cab-to-tray gap. Canopies that extend toward the cab's rear panel require clearance for both static fit and dynamic flex on corrugated bush tracks. Insufficient gap risks panel contact and paint damage under load.

How to Cross-Check Your Canopy or Tray Cover Against These Specs

Once you've identified and avoided the common fitment mistakes, the next step is converting that knowledge into a structured verification process before you contact any supplier.

Step 1: Build your personal measurement record first. Physically measure your specific Cannon and record internal tray length, internal width at rail height, internal width at wheel arch height, deck height from ground, and rail height above the deck, labelling the record clearly with your variant (standard Cannon, Cannon Alpha, or cab chassis). Do not rely on published specs alone; minor production tolerances mean your individual vehicle is the only authoritative source.

Step 2: Know what to request from a supplier. Any canopy product listing should confirm four minimum data points: internal canopy width at the narrowest mounting face, canopy length, mounting clamp compatibility with the GWM Cannon rail profile, and overall installed height above the tray deck. If a listing omits any of these, request them directly before ordering.

Step 3: Use the NotJust4x4 Make-Model-Year vehicle selector. Filtering by your exact Cannon variant surfaces only accessories already verified for that configuration, eliminating manual cross-referencing against generic specs.

Pre-purchase checklist: confirm internal length match within the tolerance specified by your canopy supplier; mounting clamp compatibility with your rail profile; internal width at wheel arch adequate for any planned drawer or storage fitment; and total installed height suitable for your regular driving environment.

For modular or high-value aluminium systems, a pre-purchase fitment consultation at a workshop with hands-on GWM Cannon experience is the most reliable final check before committing.

Get the Right Fit for Your GWM Cannon Tray

Once your checklist is complete, the path forward is straightforward: internal tray length and internal width at the wheel arches are the two measurements that determine whether a canopy or tray cover will fit your GWM Cannon without modification. Every other dimension matters, but these two are non-negotiable starting points.

As covered in the Cannon Alpha section above, confirm your exact variant before comparing any product specifications.

NotJust4x4's Make-Model-Year vehicle selector filters canopy and tray accessories specifically verified for each GWM Cannon variant. Use it to confirm compatibility and explore the full range of Cannon-matched accessories before ordering.

If you have confirmed your measurements and are ready to proceed, NotJust4x4 ships nationwide across Australia. If you want a professional assessment of mounting compatibility before committing, particularly for modular or high-value aluminium builds, book a fitment consultation at the NotJust4x4 workshop in Melbourne. Both options are available, and neither requires guesswork.

Conclusion

Getting the measurement and verification process right is what separates a first-time fitment from a costly return. The dimensions covered in this guide give you a reliable reference point, but specifications alone are not a substitute for careful cross-checking against your specific build.

Your Cannon deserves a fitment that works first time. Get the measurements right, confirm your variant, and order with confidence.