Field guide 02 · Scenario library

Compare Common Tow and Trailer Configurations

Seven original field cards show what can be observed, recorded, and verified. Their diagrams are conceptual—not official class tables and not a substitute for current operator guidance.

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Start with how the second unit moves

Filters only organize these fixed editorial examples. They do not analyze your vehicle.

Scenario 01

Passenger Vehicle + Utility Trailer

Passenger Vehicle + Utility TrailerConcept diagram — not to scale

Powered Vehicle: A passenger car or crossover supplying power.
Trailer or Towed Vehicle: A small empty or loaded utility trailer.
Visible Axles: Observe the passenger vehicle axle lines and the trailer’s actual road-contact layout.
Plates Present: Separate plates may be present; do not submit their numbers here.
Possible Transponders Present: Inventory the device in the powered vehicle and any device inside carried equipment.
Questions to Verify Before Travel: Is the trailer attached for both legs? Does its axle layout differ from the last trip?
Records Worth Keeping: Private side image, general date/route, load state, and attachment time.
What Changed From a Normal Trip: A rolling unit and coupling have been added to a normal passenger trip.

Scenario 02

Pickup + Boat Trailer

Pickup + Boat TrailerConcept diagram — not to scale

Powered Vehicle: A pickup or other tow-rated vehicle providing power.
Trailer or Towed Vehicle: A boat resting on a purpose-built trailer.
Visible Axles: Document the road-contact axle lines of the pickup and trailer assembly—not the boat itself.
Plates Present: The tow vehicle and trailer may have separate plates. Keep any identifying details in your own records.
Possible Transponders Present: A device is commonly present in the powered vehicle; still inventory any device left in another transported unit.
Questions to Verify Before Travel: Is the trailer single or tandem axle? Does the return trip have the same load state? What current operator guidance needs confirmation?
Records Worth Keeping: Private side-view image, launch or pickup time, load-state note, attachment time, and trip reference.
What Changed From a Normal Trip: A seasonal trailer and its road-contact axle lines have been added to an otherwise familiar vehicle.

Scenario 03

SUV + Camper

SUV + CamperConcept diagram — not to scale

Powered Vehicle: A sport-utility vehicle providing the power and primary driver position.
Trailer or Towed Vehicle: A travel trailer or camper coupled behind the SUV.
Visible Axles: Record the SUV’s road-contact axle lines and the camper’s actual single- or tandem-axle layout. The example drawing is not a count for your trip.
Plates Present: The powered vehicle and camper may each display separate registration plates; note only whether separate plates are present in your private record.
Possible Transponders Present: A device may be mounted in the SUV. Check whether any other device remains inside the camper or another carried vehicle.
Questions to Verify Before Travel: What is the camper’s actual axle layout? Has the complete combination changed since the last trip? Which operator-specific device guidance applies?
Records Worth Keeping: A full side-view photograph kept privately, general travel date, attachment time, and a plain-language combination description.
What Changed From a Normal Trip: The SUV is no longer traveling alone; a second rolling unit, a coupling, and additional road-contact axle lines are present.

Scenario 04

RV + Dinghy Vehicle

RV + Dinghy VehicleConcept diagram — not to scale

Powered Vehicle: A motorhome or recreational vehicle supplying power.
Trailer or Towed Vehicle: A passenger car pulled behind the RV by an approved towing arrangement.
Visible Axles: Observe which axle lines of the RV and towed car contact the road in the actual setup.
Plates Present: The RV and towed car are distinct vehicles and may each display a plate.
Possible Transponders Present: A device may be present in both the RV and the car. Official rules, not this guide, determine the correct handling for a vehicle under tow.
Questions to Verify Before Travel: Is the car rolling on all wheels, partly supported, or carried? Which current operator instruction applies to the device inside the car?
Records Worth Keeping: Full-combination photo kept privately, connection type, general date/route, and when the car was attached or detached.
What Changed From a Normal Trip: A second vehicle—and potentially a second device—is physically present in the moving combination.

Scenario 05

Light-Duty Tow Truck

Light-Duty Tow TruckConcept diagram — not to scale

Powered Vehicle: A tow truck providing power and carrying or lifting part of the load.
Trailer or Towed Vehicle: A disabled vehicle connected by wheel lift or another professional towing setup.
Visible Axles: Record the truck axle lines and which axle lines of the disabled vehicle remain on the road; the load method matters.
Plates Present: A plate may be present on both powered and disabled vehicles. Keep identifiers out of website correspondence.
Possible Transponders Present: A mounted device may exist in each vehicle. Confirm current operator requirements before the trip.
Questions to Verify Before Travel: Which end is lifted? Which wheels remain on the road? Does the return trip occur without the disabled vehicle?
Records Worth Keeping: Internal dispatch reference, private configuration image, load and unload times, and general route note.
What Changed From a Normal Trip: The tow truck’s physical road configuration can change between empty, wheel-lift, and fully carried trips.

Scenario 06

Rollback Carrier

Rollback CarrierConcept diagram — not to scale

Powered Vehicle: A tow truck providing power and carrying or lifting part of the load.
Trailer or Towed Vehicle: A disabled vehicle connected by wheel lift or another professional towing setup.
Visible Axles: Observe the rollback’s own road-contact axle layout; the carried vehicle’s wheels rest on the deck.
Plates Present: A plate may be present on both powered and disabled vehicles. Keep identifiers out of website correspondence.
Possible Transponders Present: A mounted device may exist in each vehicle. Confirm current operator requirements before the trip.
Questions to Verify Before Travel: Which end is lifted? Which wheels remain on the road? Does the return trip occur without the disabled vehicle?
Records Worth Keeping: Internal dispatch reference, private configuration image, load and unload times, and general route note.
What Changed From a Normal Trip: The same carrier alternates between empty and fully loaded physical states.

Scenario 07

Auto Transporter

Auto TransporterConcept diagram — not to scale

Powered Vehicle: A truck or tractor powering a carrier or transport deck.
Trailer or Towed Vehicle: One or more vehicles carried on a deck or dedicated transporter.
Visible Axles: Observe the road-contact axle lines of the powered transporter and carrier. The loaded vehicle’s wheels may rest on the deck rather than the road.
Plates Present: The transporter and carried vehicles may display plates; identifying numbers belong only in controlled company records.
Possible Transponders Present: Devices may remain inside carried vehicles as well as the powered unit. Inventory their presence before departure.
Questions to Verify Before Travel: Which wheels actually contact the road? What changes on the empty return? What operator guidance applies to devices inside carried vehicles?
Records Worth Keeping: Private full-profile image, loaded/empty status, internal trip reference, departure time, and load-change time.
What Changed From a Normal Trip: The outbound and empty-return configurations can look different even though the same transporter is used.