I use a 2 post quite often, too bad you didnt post this last week when I did my oil.
I make sure that the pads, if your lift has pads, are all the way up. This clears the suspension on stock trucks, not sure about lifted ones.
After that I make sure things are lined up so the pads are resting on flat parts of the frame, and up she goes.
I may have my D1 up on monday to find a mystery "thunk", I will try to remember to take pictures of where the pads go. It usually takes a few tries and me running around the truck to make sure everything is lined up properly.
I worked at a garage as a kid and saw a suburban fall off a lift, dont what that to happen with one of my trucks....
If all you have are the metal flip up tabs on your lift, I dont know what to tell ya about that one.