Check out Class racer forum. Check out the Stock/SS forum and look up the Illinois towing post. Joe Tueton gives a lot of great info. Apparently cops(local and state) don't know much about the laws they are trying to enforce and yes it seems to be a $$$$$ thing. Read all of Joe's posts.

Illinois is a communist state.

According to the OP posted link, if the driver doesn't have his IRS tax return with him ( a facetious comment in the link) and the LEO has any suspicion its a commercial use, he cites the driver and says tell it to the judge. Hard to believe a decal constitutes enough suspicion to warrant a citation.-What link are you referring to? I did not post a hyper link.

The link also mentions transporting fuel in a "non DOT approved fuel cell", I don't know of any DOT approved racing fuel cells.
-Again what link? Correct Racing Fuel Cells are not DOT approved , hence the citation

So now you know why I said "What???"

So drain the fuel cell and you would be legal on
that aspect

Is a stock tank DOT legal? Does this apply only to towing or driving a car with a fuel cell also?

A production fuel tank is approved, being that it
passes all fed impact test(we have a standard 301
that the car/truck must pass) to be able to sell
the car/truck... I dont know if a fuel cell is DOT
approved or not.. being that its sold for race car
use, I would think it passes testing OR the fuel cell
company would be sued if a failure occurred.. JMO
on the cell part

Most fuel cells are not DOT approved that was the reason for him getting the citation - Some fuel cells are DOT approved but they are mainly in Baja Trucks that run in California and they also meet Calf. CARB laws

Most Racing Fuel cells meet SFI certification and that is for Racing only
DOT is for use on Public streets and highways

See how smoothly things go when the government "helps" us?

I didn't read the link, but whatever it says, has probably been said before and is probably a law on the books NOW. The problem is, the laws are different in every state and even the officers don't really even understand what the law IS, nor how to enforce it. Boils down to this. If an officer WANTS to give you a ticket, he WILL and there will be some type of look at some law, that will allow him to do so. Luckily, most of the time, they never give race rigs, lettered or not, a passing glance. Stickers on a car or trailer does NOT automatically mean anything, other than you have stickers. I see trucks and cars running around all the time on the street with various stickers. Does that mean they automatically race for money? of course not and if you don't TELL anybody what you do with your car, they sure aren't going to know.

Stories like mentioned above, we hear about now and then and are likely all true. But out of the thousands and thousands of race rigs that get hauled all over every year, the incidents are a very small percentage. I have never much worried about it myself and have never been pulled over. For one 5 year stretch, I hauled my stuff all over the nation with no tag on the trailer and never once even got noticed

But WEIGHT is most guys problem. A gross of over 10,000lbs requires a DOT number. A dually, with an enclosed trailer of any size, race car and other items, WILL be over 10,000lbs. Just depends on if they choose to enforce it and check your weight

I believe at the PRI show there will be reps from the DOT and will take Q's and A"s.

That would be nice.. BUT the cops HAVE to know the
laws and enforce them when needed... not just because
they want to give out a ticket and say... tell it to
the judge.. I know damn a well that the guys hauling
to and from races/anywhere want to be legal.. we dont
want the hassles of being pulled over and maybe lay
out hundreds or thousands of bucks... if its out of
state you have to show up in court or just pay.. most
times its hard to make it to court... and I think that
is part of the reasons they give the tickets.... JMO

Mr P is right, only interpretation that matters to us is the guy's who is standing in front of us with the pen and ticket book.