In the other combination box you get two more AC plug-ins and a cable TV connection. The first method is to order them on your new truck. Xantrex looks forward to announcing aftermarket programs with other parts programs in the near future so check our web site often. You may not realize it but chances are you are already working your batteries pretty hard and adding an inverter isn't going to make things any better. A solution to this problem is a high quality battery charger.
Deep discharge is the number one cause of premature battery failure.
That all depends on the devices you intend to run from your inverter. High power loads like microwave ovens, coffee makers and power tools will deplete the energy stores in your batteries much quicker. Fortunately, as you have no doubt noticed the high power loads do need to operate for long while the lower power loads typically operate for hours. Inverters are ideal for these types of loads. If you have access to AC power and can plug your truck in you can operate your appliances indefinitely.