Hello, I'm new to this forum so apologies if this is in the wrong area but I'm looking for a little bit of help. I'm basically replacing the head unit in my car with a nexus 7 and I'm going to be using it for various add ons such as reversing camera, memory stick, digital tv ect ect.. basically I've bought a micro usb to usb convertor and a usb block and want to run multiple usb's off the tablet, can someone possibly help me out and tell me how I'd go about setting it up so I select each usb through the tablet if possible? I understand I may only be able to use one usb at a time but wondered how I'd go about it? Thank you kindly Tim