GDAY,
MATE I'D GO AN ALLOY TANK. PUT IT THIS WAY, THERE IS ALOT OF MANUFACTURERS OUT THERE USING PLASTIC TANKS AND THEY ARE NOT THAT BAD, THE AVERAGE FUEL CADDY THAT HOUSES MOST TINNIES ARE ALSO PLASTIC, THERE ARE NO BAFFELS IN THE SMALLER ONES AND THEY ARE MOSTLY USED ABOVE DECK,60LTRS OF FUEL ISNT THAT MUCH WEIGHT TO CONSIDER, REALLY ITS ABOUT THE WEIGHT OF A BIG KINGGIE OR TWO,