Success!
Four usb ports (switched via switchpros), three movable (and removable) ball mounts. One GPS antenna.
Thanks @nakman , another excellent product.
Hope to install my Gamiviti expedition rack today if I can convince my son to help with lifting.
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Another small vendor product I'm trying out is this mic clip from Expedition Essentials. It mounts on a Ram ball, so there are nearly infinite options for where to put it.
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... plus ipad mini and Gaia gps - I need to find my bag-o-Ram parts and put a longer arm on the mic mount.
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