The problem with trackers in a remote power application is that they give you the biggest boost of power during the summer, when you don't need it. Power gains during winter are minimal. At my house, our batteries are full by 10 am on summer mornings, even though we need to run the generator a couple hours per night in the winter. This is because during summer, the sun travels a wider arc in its daily traverse across the sky, and is at a higher angle. If you live near the equator, of course, this doesn't apply to you.
Trackers are much more effective near the equator.
If you are pumping water, however, your goal is to move as much liquid every day as you can, especially during summer. Tracking solar panel mounts would be a wise investment for this application.