This is one of the reasons I sold my triple axle tag. The way the rules read, a triple axle puts you into CDL territory no matter what.

If you have a pick-up truck and enclosed trailer with 2 axles, you should register your truck for the combined weight, carry a copy of that exemption, and that should cover you for all but the most Gonzo cop. My personal opinion is to not letter the trailer either, as it just attracts unwanted attention.

On the fuel transportation, my understanding is you are not required to placard your vehicle flammable unless you have more than 1,000 lbs of fuel. A 55 gallon drum is about half that, so most racers wouldn't be affected.

And don't placard your vehicle just to "cover yourself." Once you've opened that can of worms, you've just exposed yourself to all kinds of problems. Placards would likely make you an instant target for DOT enforcement.