The detail to resolve first
A V-Class and a Sprinter can have very different seating layouts. Count every traveller, including children, and list suitcases separately. For a group with large luggage, ask whether one vehicle is suitable or a second luggage arrangement is needed.
Prepare a workable enquiry
Count the bags separately from the passengers. Include bulky items and provide dimensions where useful. Ask for the exact configuration rather than relying on a vehicle-category label.
Check the written arrangement
Ask which parts of the itinerary are included, how waiting is handled and what to do if the schedule changes. Identify any tickets, guiding, specialist assistance or extra stops that require separate arrangements.
Keep the written confirmation available to the passenger. An enquiry or a WhatsApp conversation is not a confirmed reservation until the specific journey has been accepted.