The ususal “go to” solution for this is the venerable 20L Jerry can. The Grenadier has limmited ways to safely carry a Jerry Can or two – with the obvious one being on the roofrack – either securely tied down or in a specifically designed roof rack holder, such as these from Rino-rack and Front Runner:

The biggest issue with this solution is access – as one needs to lug over 20kg of full Jerry can onto your roof-rack, and then also get it down at a later stage. There are other roofrack alternatives, with mounts for Rotopax or similar smaller fuel containers readily available.

Black Sheep have some alternatives to the roof rack. One is a mount on the spare wheel for the 8.5L rounded fuel can from Overland Fuel. This stainless steel bracket uses the Overland lockable mount, and can be adjusted to different offsets of the rim, and is suitable for 17 and 18 inch rims. It does look like it would be a pain when it came time to use the spaire wheel, as it apears to mount directly to the spare wheel itself.

The other option from Black Sheep is a side mounted load carrier, mounting over the rear side window. The load carriers are mounted on the original railing and on the lower, external equipment rails (l-track) of the vehicle without drilling. The load carriers consist of two vertical and two horizontal supports with multiple mounting holes. These can be used to mount various accessories such as recovery boards or, as in this case, fuel (or water) cans. The picture shows mounts and 9L cans from Overland Fuel, although I’d guess that similar offerings from Rotopax and other manufacturers will fit just as nicely.

Expedition HQ Australia have released XSPEC, a range of accessories to suit the Grenadier. These utilise a mounting platform over the rear window, attaching to the roof rail and the l-track. The range includes a self feeding fuel tank and a more traditional Jerry can holder.