nice pics there.... now the all time question... which is better... leafs or coils for the tracker??? and why???
I'd say that coils would be the better route. You could get lots more flex out of coils, due to the nature of the design.
Remember that leaf springs were used on buggies drawn behind horses. And coils are the new high-tech answer.
The only down side is that you may need access to a good coil fabricator (make your own coils easily/cheaply), and lots of 'know-how' to engineer proper linkage, (AKA time) to get a coil suspension setup right.
Not many people have access to those resources so leaves are the cheap and easy alternative.
~Nate