There isn't much to blow around at a RoRo terminal; every thing is massive or in containers. I have had no problems, albeit a few years ago, at Le Havre and Southampton. We just threw the blades on and punched off.
The biggest problem was at Southampton. Taking a break we wandered over to an adjacent cafe for a tea and wad.
"Are you registered?"
"Eeerr, no"
"Cannot serve you. This place is for registered dockers only."