[Jeff Teuton]

DOT limit on fuel is 1000 lbs. Don't need placards or other notices. A drum of fuel weights about 400 lbs. Length is state. If your rig it titled in any company name or venture (Super Fast Racing), you are DOT. Personal name, DOT manual 390.3 and get a copy (they are cheap), most motor home plates have no weight and are just a token tag much like a trailer. Most police officers know less about this regulation than you do. Hope this helps. Manual available from LabelMaster, Chicago and the number I have is 1-800-621-5308 Federal Motor Carier Regulations. Probably got a web site too. Just found LabelMaster, what you want is the Federal Motor Carrier Safety Regulations, Management Edition. They are about $13 hard bound or $15 spiral plus shipping. Pretty good tool to have, and 390.3 is the section about race car (and boat and horses etc ) exemption.