IMHO and that of probably everybody on Expedition Portal, there is no home refueling container that's safe for expeditions. The Scepter cans from Canada are now only allowed for military sales, so the pre-ban cans are going for $75-100 on the aftermarket. I've got eight of the things, but I saw the end coming a few years ago. These are the ones you can drop from a helicopter from 50- feet up and they survive. I used to strap these to my roof rack, but never again. If they leak or get punctured for any reason, they'll drip down into your liftgate crevices and tail lights, with possibly explosive results. Mount them only where they can't drip on the vehicle, which is going to be some sort of rear bumper location.
Wedco metal and other sorts of NATO cans are the ExPo choice nowadays. But the thin and sortof rugged ATV Kolpin fuel packs are getting some followers.
Whatever you decide, if you run out, $75 is going to seem a cheap price to pay for more fuel. I've carried fuel on dozens of trips, and only USED it three times in six years. You can plan carefully, but still have something unexpected come up, and the peace of mind is priceless. Please don't cheap out on safety by using home plastic cans. Scepter makes some of those, don't be fooled. If you EVER see a good Scepter can on craigslist or yard sales, snap it up. May need a new gasket, but that's relatively cheap.