They are kind of a pain to install
I helped a buddy set up a bunch of the npg trackers and thought it was a breeze. They came with everything wired and numbered, did not even need the manual. Then when I bid a job installing the Watsun trackers I lost my shorts on all the little stuff that I thought was included. If you bid on a Watsun job make sure you bid high enough to cover all the brackets and extra time it takes drilling all the holes and stuff. I am sure it is a decent tracker, but I have seen better.
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