Rob - I have (2) 5.28 gal cans I carry for long hauls like this , issue is you still have to stop. I was trying to avoid that (safely).

There has to be a way. I know Jeep guys do some magic w/ fuel level and filler tube which gets you 3 extra gallons on a Cherokee.....I'm going to head to the race shops here in the Charlotte area this week to see what they say..