So after adding the latest device this weekend to my Auto PC setup, I now have 7 USB devices hooked up and amazingly enough they all work just fine. This is all running off of the Opus 90W power supply too. Of course this required using two hubs daisy chained, but I like that design because the hubs are self-powered (+5V off Opus power supply) so they will turn off when the ignition/PC turns off and not drain my battery.

USB devices:
XM
GPS
Audio
Keyboard
Mouse
DVD/CDRW
Wireless Network Adapter

Serial:
Digitmoto OBDII Scanner

 

I don't suppose you have any pics of your setup that you could share with us? I'd love to get my Z computerfied...

 

I haven't taken any recently since I built the unit into the mailbox slot. I will try and get some over the next few days and post them.