Adding an Outfit to My Profile

We've just booked the ferry for our pre-christmas trip to visit our grandsons in France using the Club booking service. Our 'profile' lists our motorhome, but we're travelling by car. There's no provision to add a car to 'My Profile'. The booking confirmation confirms that we're taking an unspecified car so fingers crossed we don't have any hiccups at Dover. Last year, doing the same journey, the P&O check-in had our 'van registration! ( but we sailed ok).

Can the 'add outfit' be amended to include just a car. We're loyal customers of the Club's booking system ( and P&O) using it 4 time a year on average.