Step one: measure the body, not the cargo
Load height changes with every consignment. The body does not. Measure body length and width, and then the vertical distance from the top rail down to the lowest point where you actually secure the cover. That last measurement is the one most buyers skip, and it is the one that determines whether the sheet reaches.
| Dimension | How to calculate it |
|---|---|
| Required width | Body width + (2 × side drop) + expected load height above the rail |
| Required length | Body length + (2 × end drop) + expected load height above the rail |
| Rounding | Always round up to the next available size |
A cover slightly too large can be folded and tied. One slightly too small is pulled tight against its eyelets on every journey, and that is where it will tear.
Step two: match the sheet to the work pattern
Long-haul, fitted once
The cover goes on at the depot and stays on. Handling is infrequent, so extra material costs you little in practice.
Multi-drop, fitted repeatedly
The cover comes off and goes back on several times a day, often by one person at a roadside. Here weight is a real operational cost.
Mixed fleet
Operators running different body sizes usually standardise on two or three custom dimensions rather than buying nearest-fit sizes per vehicle.
Step three: get the tie-down pattern right
Use every eyelet
A cover roped at four corners puts the entire wind load through four small areas of fabric. Roping through every eyelet spreads it across the whole edge.
Rope front to back in one consistent pattern
Inconsistent tension concentrates load. A single repeating pattern is easier for a driver to reproduce at 4 a.m. than a clever one.
Tuck and tie loose edges
An unsecured edge beats against the body at speed. Over a long run that flapping does more damage than the rain.
Re-check at the first halt
Loads settle. A cover that was tight at the depot is often slack an hour later, and slack is what starts flapping.
Step four: plan for the failure points
Truck covers rarely fail in the middle. They fail at eyelets that took uneven load, along edges that were left free to beat against the body, and at the points where the sheet passes over a sharp corner of the body or a projecting fitting. Padding those corners costs nothing and extends cover life more reliably than a GSM step.
Maintenance that actually matters
- Dry the sheet before folding it for storage; folding a wet cover invites mildew at the creases.
- Fold along different lines each time rather than repeatedly on the same crease.
- Repair small tears immediately — a 5 cm tear at highway speed becomes a 50 cm tear.
- Store out of direct sun when the vehicle is idle for long periods.
On GSM for trucks
A GSM recommendation for truck use without tear and tensile figures behind it would be a guess, so we confirm those directly against your specification rather than publish one. What is not a guess: a correctly sized cover with a proper tie-down pattern outlasts an oversized-GSM cover fitted badly, every time.
Written by the Double Kissan team at Ashoka Poly Laminators Pvt. Ltd., Bareilly. Last reviewed November 2026.