http://www.fmcsa.dot.gov/rulesregs/fmcsr/regs/390.5.htm:
<blockquote><b><i>Commercial motor vehicle</i></b> means any self-propelled or towed motor vehicle used on a highway in interstate commerce to transport passengers or property when the vehicle --
(1) Has a gross vehicle weight rating or gross combination weight rating, or gross vehicle weight or gross combination weight, of 4,536 kg (10,001 pounds) or more, whichever is greater; or
(2) Is designed or used to transport more than 8 passengers (including the driver) for compensation; or
(3) Is designed or used to transport more than 15 passengers, including the driver, and is not used to transport passengers for compensation; or
(4) Is used in transporting material found by the Secretary of Transportation to be hazardous under 49 U.S.C. 5103 and transported in a quantity requiring placarding under regulations prescribed by the Secretary under 49 CFR, subtitle B, chapter I, subchapter C.</blockquote>
<blockquote><b><i>Motor carrier</i></b> means a for-hire motor carrier or a private motor carrier. The term includes a motor carrier's agents, officers and representatives as well as employees responsible for hiring, supervising, training, assigning, or dispatching of drivers and employees concerned with the installation, inspection, and maintenance of motor vehicle equipment and/or accessories. For purposes of subchapter B, this definition includes the terms <i>employer</i>, and <i>exempt motor carrier</i>.</blockquote>(gotta love it when they use the term to define the term they're defining -- I think that's "illegal")
<blockquote><b><i>For-hire motor carrier</i></b> means a person engaged in the transportation of goods or passengers for compensation. </blockquote>
<blockquote><b><i>Private motor carrier</i></b> means a person who provides transportation of property or passengers, by commercial motor vehicle, and is not a for-hire motor carrier.</blockquote>
<blockquote><b><i>Exempt motor carrier</i></b> means a person engaged in transportation exempt from economic regulation by the Federal Motor Carrier Safety Administration (FMCSA) under 49 U.S.C. 13506. "Exempt motor carriers" are subject to the safety regulations set forth in this subchapter.</blockquote>
<blockquote><b><i>Employer</i></b> means any person engaged in a business affecting interstate commerce who owns or leases a commercial motor vehicle in connection with that business, or assigns employees to operate it, but such terms does not include the United States, any State, any political subdivision of a State, or an agency established under a compact between States approved by the Congress of the United States.</blockquote>
<blockquote><b><i>Interstate commerce</i></b> means trade, traffic, or transportation in the United States --
(b)(1) Between a place in a State and a place outside of such State (including a place outside of the United States);
(b)(2) Between two places in a State through another State or a place outside of the United States; or
(b)(3) Between two places in a State as part of trade, traffic, or transportation originating or terminating outside the State or the United States. </blockquote>
It sounds like the only thing they could get you on is the weight, but for the fact that you're not hauling material (freight)!
Sure, they'll probably write tons of tickets and sheeple will pay the fines, even thought they don't pertain.