I have dual 2000s also, and found a fuel tank for extended running. It was an easy hookup, and works perfectly if a little pricy.
http://www.wisesales.com/DurationTanks.html
Texas camping can get hot in the summer, and if you need AC, to keep one running thru the nite is challenging. You can actually sleep thru the night without getting up to refuel after 4-5 hours.
Wish I had been following forums a little closer, and I could have saved some money and had a fun project. On another forum, some folks were describing how to make your own tanks. Below is the forum index where generator tanks are discussed.
http://www.rv.net/forum/index.cfm/fu...2.cfm#16874152
I selected a url of a very interesting home-made version w/pics from the thread.
http://www.members.cox.net/ccandies/Hondas