Just got a new "old" fire TV. Should I root it?

I've got 4-5 AFTV's set up in my house running XBMC Gotham with a custom skin connected to my LAN serving content off of my NAS. Family loves it.

Want to put one in the car. So...

No network connection
XBMC Gotham
2TB HDD connected to USB port

Can this be done? IE use a FTV without a network connection?, connect a 2TB drive? (I can connect huge drives to my in-house, non-rooted FTV's)

Should I root this box or let it update and will it act like the ones I have in house? I put FiredTV app on the ones in the house to jump to a menu where I can quickly start XBMC. Is there a better way with rooting?

Is there a good resource I should go to to find out about these things?

Thanks for the help.

Roveer