I'm going to attempt to answer the OP's original question, at the risk of drawing the ire of everyone else.
Your cab should have a handle on the top or two handles on the sides. If there are two on the sides, you might be able to do a proper squat lift from the ground. But let's assume you can't get a good enough position on it to do that. The next thing to try is to tilt the cab, slide something that's 6"-10" high underneath it, and then level it out on the higher surface. That should put you in a better position. Hug it close to your body, keep your back vertical, and lift with your legs.
If it has a strap handle on the top, what I do in situations like that is put one leg forward and use it as a fulcrum. Probably a good idea to start by elevating the cab a bit using the tilt method described earlier. Keep your back straight, lean back just a bit, and lift the cab using your arms. Once it's high enough to rest on your thigh, bend your knee a bit as if you were lunging. That will tilt the cab and elevate the bottom on the far side, and it should be enough for you to rest it on the cab you are stacking on. If not, you can lift it higher by extending your ankle with your calf muscles and rolling your hips forward. Once it's there, you can slide or shuffle it forward a bit if need be, and then just pivot it up the rest of the way onto the other cab, and shift it around to where it's going to be.
