I am going to replace my fuel tank. It is basically 18 gallons and rectangular with standard hold down straps. It is not really underdeck but it will be behind a bulkhead. The money is not that much different. There are four basic choices that I can see: 1.) Red plastic, 2.) Black Plastic, 3.) Brown Plastic, and 4.) Aluminum. By all indications they are rated for gasoline, have sending units, etc...<br />What have you guys used? Is one choice better than others?