I have two of the Gorilla ultralight aluminum stepladders,
both of the ones listed here. They are much lighter than they look, and I like the large flat area for standing. One of them lives permanently in the back of my truck for photo use. I bought them at Home Depot -- had the short one for years, and recently bought the taller one.
I don't know how well any stepladder will work on uneven ground. They sort of need a flat surface to remain stable.
Edit: I notice that the link shows a photo and a description of the taller ladder that is not current -- the ladder I purchased has two large standing platforms, not one. More useful that way. But the shorter one gets more use for photo work.