I want to add a 1000 watt XANTREX inverter into my 08 suburban. Before I start completely diving into this project, I was thinking that it may benefit me to add a second battery to assist with the electrical load that I'll be working with while towing and having a bunch of kids gadgets/ laptops charging. I know adding the battery isn't hard, especially with a vehicle that is physically set up already, but do you guys know if I need to upgrade the alternator too? Any other pitfalls along the way that I need to look out for? Thinking of mounting the inverter under the second row seat.