I made it out to my rig today and got a few things done, put a handle on the screen door, added the "buddy" remote to the converter and I can confirm it is the 9260.
I mounted a Victron battery monitor on the wall by the solar controller. Too wet to get underneath to run the wire to the battery box.
I did pull the usb charger off to see what's up and noticed it has a small power switch and green light that comes on. It's a 5 amp sealed unit and all my ports are working. And the light switch did not have to be on
As for surround sound I guess I just consider it basic car audio quality, I have a 5.1 tv system and a 7.1 theatre at home and I'm sure a new head unit, amps and speakers would make a huge difference. A sound bar with a centre speaker would be great.