Model tank tread

Hi, I want to model a simple tank tread like the one shown here.


This is for drawing reference, so it doesn’t need to be perfect. If I knew how to make a rounded rectangle, I’d probably do that and then extrude it and add the bits and pieces, but I am not sure that is the right approach, and I don’t know how to make round rect in any case.

I have not done a lot of modeling other than basic stuff in Blender. I know how to do the basic operations.