The detail to resolve first
Seats and luggage share physical space. Ask whether the proposed seating arrangement still accommodates the bags and equipment you listed. A maximum passenger number should not be read as a promise that the same number of large suitcases also fits.
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.