Quick Answer: For most buyers who carry gear, camp or run a rooftop tent, aluminium wins on roof load, repairability and panel security. Fiberglass wins on price, shape variety and a smoother painted finish. If your roof must carry a tent, the decision is made for you: aluminium — because published static roof loads in the 150–500 kg range are an aluminium/steel spec, while fiberglass makers rarely publish a tested number.
The short version
| Aluminium | Fiberglass | |
|---|---|---|
| Roof load | 150–500 kg static by thickness, testable on video | Rarely published; typically lower |
| Weight | ~45–60 kg for a full-size canopy | Similar or heavier |
| Damage behavior | Dents; repairable by bending/welding | Cracks; repair needs specialist work |
| Security | Panels hard to pierce; anti-theft locks standard | Panels easier to lever open |
| Finish | Powder-coated industrial look | Smooth automotive paint, any colour |
| Shape options | Angled, wedge, gull-wing builds | Widest variety of shapes |
| Corrosion | None on aluminium; hardware needs plating | None on glass; watch mounting steel |
| Price | Mid to high | Usually cheapest |
Where aluminium wins
Roof load you can verify. This is the deciding factor for rooftop-tent and overland buyers. Our aluminium canopies publish static ratings by thickness — 200 kg at 2.0 mm, 500 kg at 3.0 mm — backed by a filmed static load test. Ask a fiberglass maker for a filmed test number and you'll usually get a brochure adjective instead.
Damage is a dent, not a crack. Off-road, panels get hit by branches, straps and cargo. Aluminium deforms locally and can be beaten back, welded or patched with standard tools. Fiberglass cracks, and a cracked shell keeps growing until it's repaired properly.
Security. A determined thief with a lever defeats most bed covers, but piercing or splitting a metal panel is a different job from cracking a composite one. Anti-theft locks and hydraulic struts are standard items on our builds.
Hardware integration. Gull-wing doors, roof racks, crossbars and brackets bolt straight to a metal structure. Every add-on reuses the same mounting logic.
Where fiberglass wins
Price. A basic fiberglass shell is usually the cheapest hardtop. If the job is "keep rain off shopping", it does the job.
Shapes and finish. Fiberglass moulds cheaply, so you get more profile variety — smooth domes, colour-matched paint, SUV-style lines. Aluminium tends to look industrial because it is.
RF transparency. Radio antennas and some GPS setups behave better under a composite shell than under a metal roof. For most modern setups this no longer matters — but if you run a whip antenna through the roof, check before you buy metal.
The questions that actually decide it
- Will a rooftop tent or rack load live on the roof? Yes → aluminium, sized by the static rating you need.
- Will the truck see tracks, farms or construction sites? Yes → aluminium; dents beat cracks when repair access is limited.
- Is the canopy mostly for looks and rain protection on pavement? Fiberglass is honest value here.
- Do you need a published, tested roof number for insurance, fleet or compliance? Only metal builders tend to have one. Ask for the test film either way.
Our position
We build in galvanized steel 1.5 mm and aluminium 2.0 / 2.5 / 3.0 mm, in gull-wing and sliding-window layouts, from 3D scan data of your model year. We don't make fiberglass — so when a fiberglass shell is the right answer for your use, we'll say so, and this page says why.
Sources
No external data cited. Trigallop figures (static roof loads by thickness, filmed load test, materials and thickness options) come from our maintained fact ledger and test records. Fiberglass characteristics are qualitative industry-common knowledge; verify specific maker claims with the maker.
Written by Trigallop Engineering Team · Reviewed by Ryan Gui · Updated 2026-10