I currently have a mac pro which has a USB 2.0 Hub attached to it (D-Link DUB-H7) and I need to add a 2nd hub. This 2nd hub would plug into this first hub and then would need to run approximately 20 ft. I would use a powered USB 2.0 like above but am open to suggestions on other hubs also. The reason I'm doing this is this will run to another room where there will be both a USB Bar-Code Scanner and a label printer plugged into this hub. Instead of getting USB 2.0 Extension cables for each of the two items I figured the hub was my better choice. Would there be any problem with running it over this distance?