I was considering adding a toy tank for extra fuel to the back of my house boat. I have had issues before with trying to get fuel pumped into a variety of different tanks at the fuel pumps on the lake. I have had employees at the fuel pumps refuse to fill tanks because they were the wrong color or because they were not approved or did not have the proper labeling on them. I would hate to spend hundreds of dollars on a tank and not be able to utilize it. What all does a tank have to have to be safe and legal? Colors - labels - venting - baffles - size - material used? I would also like to hear about any options or pumps that others have used. Thanks in advance!