We used to get "off road" fuel, but drive all new vehicles so they all need ultra low sulpher.
And by the way, if you get your tank dipped and it comes up red, you will not only be super fined, but red tagged, which means you go no where till the tow truck comes and gets you, if they don't impound it till your court date. And oh yea, they can also seize your truck because it is used in the commision of a felony. Now thats something your "bussiness" consultant / coach will not tell you...huh
You can apply for a tax rebate for the fuel that is used in your burners or any thing that is not used on the roads. There also Federal programs that can help you re coup the cost of the taxes on off road fuel.
Look around....