Overboard...I put 40 gal tanks under each seat box (80 gals total), so w/the addition of the fuel-sippin' Honda, I got plenty of range...
To add a 20 gal tank wouldn't take a very large seat-box at all and shouldn't be too heavily weighted on one side(burn it off 1st goin' out)...good luck w/it and let us know what ya do...
