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Dave,
The major problem with disconnecting via. the positive terminal is that unless the associatied wiring and terminals are insulated, an accidential connection to this exposed wiring will create a major spark and current surge. As mentioned in other threads, this spark can potentially create a major meltdown or fire. For example, even with the positive terminal disconnected - perhaps using a disconnect switch within the front storage area adjacent to the battery - any exposed switch terminals which still have 12V present can be accidently touched with a tool, tripod, or any other metal device that is also in contact with the frame. If this occurs, you will instantly know it and wished that it hadn't occurred.
On the other hand, any accidental contact with any portion of any switch or terminal connected in the ground circuit will do will cause no major problem or meltdown.
If you use a disconnect switch on the positve side, be sure to insulate all exposed connections or you may accidentially cause a major meltdown.
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