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The ground is a grounding block screwed to the floorpan of the cargo area. Even with all of these precautions, I still have a tad bit of alternator whine, but it's hardly noticable except when I crank the levels on the amps.

An update on the whine, I found out the custom RCAs that I had made were faulty somehow. The whine was traced back to them, I've replaced the interconnects with standard JL interconnects and NO whine whatsoever now! I was pretty worried that it would be something bigger.

One other issue that I had that I've resolved is the amp relay. The first relay I was using somehow shorted out and kept draining my battery every other day. I think it was because I put a lot of heat through it while I was soldering the wires to the pins of the relay, so I cut it out and replaced it with a relay plug instead. This winter I've had to replace my battery because I drained it to nothing so many times it wore it out. So, new relay and new Die-Hard Gold and I'm set.
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Mark Cushman