[prairieschooner]

Ok, the Box houses the Relays that allow you to switch from Shore to Generator from the Driver's Seat, a very valuable feature! This allows you to turn on the AC Generator and then Switch to the Generator Source and run the Air Conditioners while Traveling down the road.
Think about installing the Battery Charger closer to the Batteries. The 9280 looks to have an 80 Amp Output, look at this Chart;
http://www.westmarine.com/webapp/wcs...arine-Wire.htm you will see how large a Cable you will need to supply the 80 Amps the distance away from the Batteries (From the Batteries to the Source and then back to the Batteries 35' away = 70'). If you choose a 10% Voltage drop then the 13.6 Volts that you are paying for turns into 12.24 Volts under load (13.6 - 10%)
This would allow you to use a smaller Battery Cable in order to keep the Voltage Drop to a minimum.
The HEART Power Inverter/Charger on our '82 is mounted at the forward Bay and just above the House Batteries. The Size of our Cables keep our Voltage Drop to the 3% Range, much more desirable to me.