There is also a 202 amp alternator out there! My guess is you would have to put any extra batteries inside in the back. I don't think you could find room under the hood. You would also have to change a lot of wires. BUT, you could turn night into day!
If you want to talk to someone that really knows about charging/battery systems get a hold of:
www.jolynenterprises.com John Palmer knows his stuff. He works on motorhomes but the principal is the same.
Terry
Life Line Batteries:
http://www.jolynenterprises.com/Battery%20info.jpg