BEAST needs more fuel capacity..!

Had to leave town (Florida hurricane)...problem is all gas stations had no fuel...I carried 30 gallons the hard way...luckily it all worked out, but I want a permanent solution. Send your pics and ideas. I have some ideas for putting it on the roof and others to go under the carriage, but may have to move the muffler. A 50 gallon would be perfect for emergencies and to stop going to the gas station 3 days a week.....!