I always sit. Either in the back of the SUV with the trunk open, or right on the grass if I'm in a park. I find it a lot easier to have one less thing to deal with (standing and keeping my balance, LOL). I also look, to a casual observer from some directions, like I'm reading a Kindle and I don't mind not getting asked any questions.
It's easy enough to stand up if needed but there's no real need for it.