Since you are transporting the Fuel in Jerry Cans, You have a chance to mix it properly. Add a gallon or 2 gas to the Can, add the correct amount of oil for a full can, Put the Cap on the Can, shake it vigorously a few times, fill it to 3/4s full, and shake it again, sloshing the gas-oil around, then top up. Tipping a tank on its side really does F all, as the tank just rotates around the fluid inside. Pouring the fuel out of the cans into the Fuel tanks will complete the mixing. Never fill the Tank, and then add the Oil. Most of the oil will just settle to the bottom, and at first the Engine will get way too much oil, and as the tank empties, it will get less oil, possibly almost oil less. Unless a container/tank is almost empty, very little agitation of the Gas-Oil occurs while in transit, the oil will simply remain at the bottom of the tank.