Powered unit
The vehicle supplying power: passenger car, pickup, SUV, RV, tow truck, or transporter.
Field guide 01 · Foundations
Understand Your Complete Road Configuration Before Travel
A powered vehicle, connection, rolling or carried unit, and every device physically present form one preparation picture. Start with those parts before looking for operator-specific guidance.
Core principleDescribe the whole moving combination, not only the familiar tow vehicle.
Four-part description
Use physical words before official labels
A neutral description is easier to verify and less likely to overstate what you know.
Connection
The relationship between units: hitch, fifth wheel, tow bar, dolly, wheel lift, or deck.
Rolling or carried unit
A trailer, car, camper, boat trailer, disabled vehicle, or vehicle resting on a carrier.
Devices present
Every transponder physically present in the powered, pulled, or carried units.
Plain-language template
A [powered vehicle] is [pulling / partly lifting / carrying] a [unit] through a [connection], with an observed [road-contact axle layout].
Six situations
Connection and road contact change the description
Select each field note to see what matters without receiving a class or toll result.
Powered vehicle
The driver and power source remain the anchor of the description, but they do not describe an attached unit.
Attached trailer
A purpose-built rolling unit follows the powered vehicle through a coupling and may be empty or loaded.
Tow dolly
Part of a passenger vehicle is supported while another part may remain on the road. Record the actual arrangement.
Flatbed
A vehicle can be fully carried. Its wheels may rest on a deck rather than creating road-contact axle lines.
Vehicle behind an RV
A second vehicle remains physically present behind the RV and may contain its own transponder.
Disabled vehicle with tow truck
The load method determines whether the disabled vehicle is partly lifted, fully carried, or rolling.
Road contact
A carried wheel is not a rolling wheel
A side-view walk-around helps separate the carrier’s axle lines from the wheels of cargo resting on the deck. On a wheel-lift tow, one axle line of the disabled vehicle may remain on the road. On a flatbed, all of that vehicle’s wheels may be carried.
These are physical observations only. Raised or lowered axles, facility rules, and official billing treatment require current operator confirmation.
Touches the road
Include it in the private physical description of the combination.
Rests on a deck
Describe the cargo separately from the carrier’s road-contact layout.