When I was a lot more involved in buying pins, I actually modified a couple of those moving straps that you put your hands through, that use your forearms to carry the load.
I put a couple of holes into each one and then secured them using the leg bolts and holes. It worked REALLY well, but obviously requires two people.
I typically used a dolly, but on some of the tighter load outs, the dolly was too big to make the turn on a lot of the steps.