Baseline the powered unit
Note the general vehicle type and whether it is traveling alone. Keep identifiers in your controlled system.
A good trip record explains the physical state at a useful moment: before attachment, while loaded, after a configuration change, and when the second unit is removed.

One permanent description of the tow vehicle cannot represent every load state.
Note the general vehicle type and whether it is traveling alone. Keep identifiers in your controlled system.
Record the connection, rolling or carried unit, observed road-contact layout, device inventory, and approximate time.
Note attachment removal, unloading, or return to an empty state so the trip sequence can be reconstructed.
Print this blank structure and complete it inside your own controlled record system. It has no web form and sends nothing.