Im not sure about the chain idea... it sounds good at first, but I think in the mornings/late afternoons you might windup with one panel shading another unless there was quite a fair amount of space between them. Maybe not.. just a thought though.
I think trackers have their place, although its a hard call to know which is the better investment, a tracker - or just more panels pointed in the 'best' direction. I expect the closer we get to the equator the more benifit well see from them. As far north as you are, I wonder if the benifit is worth the cost.
I cant speak for anyone but myself, but here.. this time of year, i start getting good power at about 9AM - 4PM. I dont think a tracker would pick up much more for me - a little perhaps. Probably less than if I just went out and bought a couple more hundred watt panels though.
