"Business", "first class", "van" and model names are marketing shorthand until you know the seating and luggage arrangement that will be supplied. Count travellers and describe the bags together.
Four adults with four cabin cases are not the same as four adults with four large suitcases and a pushchair.
A child seat or an unusually shaped item changes the practical calculation. The seat count alone does not prove that every bag will fit safely.
Ask the provider what category is proposed for your party, then check whether an equivalent vehicle may be used. Photographs can illustrate a class of vehicle without guaranteeing that a particular model, registration or cabin will arrive.
Paris Private ExperienceFor Paris Private Experience, the categories are E-Class, V-Class, V-Class XL and S-Class or equivalent. We check the group and bags before recommending a category and confirm it for the booking.
If a specific need depends on a certain configuration, raise it explicitly before the quote is accepted.
For a larger party, one oversized vehicle is not the only possible answer. Several coordinated cars may better serve travellers who arrive on different trains, have different addresses or need separate departure times. A minibus or coach may be considered for a suitable group and route, but capacity and access must be checked for the actual itinerary. The best vehicle choice is the one that fits both people and the journey, not the most impressive label in a catalogue.