I have one of those, can fit a 2 gal can where the cooler is supposed to go. That helps cause then youve got close to a full tank on the back. Just be careful, I used mine once so far and had the gas cans pop out about five or six times within a hundred miles. Or you stop cause you smell gas and find out that one of the cans are leaking from somewhere and spilling fuel all over the exhaust!!!! Yes, I had them bungeed to the hilt, also. It was a very mild, smooth trail that you'd guess you could drink a cup of coffee down.
Keep an eye out on ebay, thats where I got mine for around 30-40 bucks.