Building out a canopy

Before you choose a single drawer, find out what you are allowed to carry.

Your vehicle has a gross vehicle mass (GVM). Subtract what the vehicle weighs as it stands and what is left is your payload: people, fuel, water, food, recovery gear and every accessory you bolt on. A canopy, a drawer system, a fridge and a full water tank can use a large share of that before anyone climbs in.

Two things people get wrong here.

The canopy’s rating is not your limit. Canopy makers publish load ratings, often one figure for when the vehicle is moving and a higher one for when it is parked. The rating tells you what the canopy can hold. It says nothing about what the load bin underneath it, or the vehicle’s GVM, will allow. One maker says exactly that in its own documentation: the canopy’s capacity may be more than the bin can take. The lowest of those numbers is the one that counts.

Water is heavy. A litre of water weighs about a kilogram. Eighty litres is eighty kilograms, before the tank, the fridge or the drawers.

The law is short and blunt about the load itself: goods on a public road must be contained within the body of the vehicle or securely fastened to it, and protected from being dislodged. Everything in this guide is built around that.

A drawer system turns the floor of the load bin into two things: a level deck on top and organised storage underneath that you reach from the tailgate.

Why it is worth it. Everything heavy sits on the floor, low and restrained, which is where it belongs. Nothing slides around. You open a drawer instead of unpacking the bin.

What to decide before you buy.

Fridge slides. A slide lets the fridge come out past the tailgate so you can open the lid without climbing in. Two checks matter more than any others: the slide’s rated load has to be more than the fridge’s full weight, not its empty weight, and the slide must lock both extended and stowed. Every maker rates its own slide, so read the figure for the one you are buying.

Slide-out kitchens. A slide or drawer that carries the stove, a prep surface and the cooking kit, so the whole kitchen comes out in one movement. The important word there is out. See the gas section below.

A camp kitchen that works has four parts: a flat surface at a sensible height, the stove, the cooking kit and the washing up. Get all four reachable from one place and cooking stops being a chore.

The prep surface. A slide-out kitchen, a tailgate-mounted work shelf or a folding table. What matters is height and stability. A surface at the wrong height gives you a sore back by day three.

Cutlery and utensils. Divided drawer inserts or a canvas roll, so nothing rattles and everything is visible. Rattling is not just an annoyance. On corrugations, a loose drawer of cutlery wears through its own container.

Pots, pans and the cooking box. A single crate that comes out in one lift beats pots scattered across three drawers.

Washing up. A grey water container, a collapsible basin and somewhere for wet things to dry. Grey water goes into a container and is disposed of properly, never into the veld or a river.

The 12V oven. A 12V oven runs off the vehicle’s auxiliary power, so you can heat food without gas. Two things to know. Any appliance that makes heat is a heavy electrical load, so it needs a properly sized auxiliary system and cabling to match. And it connects through an Anderson plug, so the plug on your system needs to match.

Gas is the fastest way to cook at camp, and it is the one thing in the canopy that can kill you if it is handled carelessly. None of the rules below are complicated.

Keep the cylinder upright and secured. LPG cylinders are made to be stored, carried and used upright. On the cylinder you will find arrows pointing up. If a cylinder lying on its side leaks, liquid gas escapes rather than vapour, and that is much more dangerous. Strap it so it cannot fall over, roll or be struck by anything else in the load.

Give it ventilation low down. LPG is heavier than air. A leak does not rise and escape, it pools on the floor of whatever it is in, and it can be ignited some distance from where it leaked. That is why the South African standard for LPG calls for low-level ventilation, and why a cylinder does not belong in a sealed box. Many people carry the cylinder outside the canopy altogether, on a dedicated mount.

Check for leaks with soapy water. Paint soapy water over the valve and the connections and watch for bubbles. Never use a flame.

Look after the hose and regulator. Replace hoses that are cracked or brittle, and replace worn regulators. Check every connection is properly tight before you open the valve.

Turn it off at the cylinder. If you smell gas, close the cylinder valve first. Never leave a lit stove unattended.

Do you need a permit to carry it? For a private person carrying gas cylinders bought for camping, no. The South African standard for transporting dangerous goods exempts private individuals carrying retail-packed goods for personal or leisure use. That exemption covers the paperwork, not the physics. Everything above still applies.

The dual-battery guide covers how the system works and how to size it. This section covers only what changes when the battery and electrics live in the canopy.

Why the battery ends up back there. Many modern engine bays have no room for a second battery. The canopy gives you space, keeps the battery away from engine heat, and puts it right next to the fridge and the lights it feeds. The trade-off is a long cable run from the alternator, which is why a DC-DC charger is the usual answer for canopy installs.

Know your battery’s rules, and follow them. Different chemistries ask for different things.

Mount it as if it will be in a crash. A heavy battery that breaks loose in an accident becomes a projectile. That is a manufacturer’s word, not ours. A proper tray or bracket, bolted to structure, is the only acceptable answer.

Fuse at the source. Every positive cable gets a fuse as close as possible to where the power comes from. If a cable is cut or rubs through and touches metal, the fuse is what stops it becoming a fire.

Size the cable for the distance. Long runs need thicker cable, or the charge you are trying to move is lost as heat along the way. Intervolt’s own minimums for its DC-DC chargers are 6 mm² for a 1 to 5 metre run and 10 mm² for 5 to 9 metres.

Plan the negative, too. The return path matters as much as the positive. Run a proper negative back to the battery or to a sound chassis point, as your charger’s instructions specify. Ask the fitter how it has been done on your vehicle.

One panel, not a nest of wires. A 12V panel mounted in the canopy gives you switched, fused outlets in one tidy place: the fridge, lights, USB charging and a socket for the compressor. It is also where you look first when something stops working.

Anderson plugs, and why the colours matter. Anderson SB connectors come in colour-coded housings that are keyed so different colours cannot be plugged into each other. That lets you keep, for example, the fridge circuit and a higher-current circuit physically separate so the wrong thing cannot be connected.

An isolation switch. A battery disconnect switch lets you kill the auxiliary system completely when the vehicle is parked for a while or being worked on.

This is the part of a canopy build that should be a professional installation. Cable sizing, fusing, mounting and routing all have to be right, and a fault back there tends to show itself on a gravel road a long way from help.

If you are doing this in stages, do it in this order. Each step makes the next one easier to get right.