Structure and movement
The defining parts of a mobile yard ramp are the sloping deck, its supporting structure and the interfaces at ground and vehicle level. The deck is a travel route, so a useful specification describes the complete load path, including the handling equipment, rather than the goods alone.
Start at the ground approach, follow the deck to the raised end and mark the transfer into the vehicle or dock. Record changes in level and direction along that route. Also describe the separate task of moving or storing the ramp; a loading position and a storage position need their own site measurements.