This is more me getting older and more lazy than a "How-To".
Once I went to the bigger and heavier 295/70/17 Nitto Trail Grapplers, I quickly realized that it was more of a challenge to mount them on the FJ when it is only a few feet off the ground. If the FJ was on a lift, I could simply pick them up and mount the tires, but when its on a jack and jack stands, I use more of my back and arms to try and mount them.
It's said that most great inventions came about because of laziness...well, in this moment is when I saw a shovel and in this shovel I saw an easier way to lift the tires. By using this shovel, I mounted all my tires without using any strength and causing my back to be sore. It's so simple, you can drink a cold beer while doing it and in the end, that's all that matters.
1) Move the tire into place and align it with the lugs while its on the ground.
2) place the tip of the shovel under the tire.
3) Steady the tire and with your free hand, push down on the handle of the shovel.
4) Once the tire comes up and is aligned with the lugs, slid it into place. Chances are it'll slid right on to the top lugs and a simple wiggle will get the tire onto the other lugs.