Hello! I am a teacher and next month we are planning to take our class on a field trip to a nearby city. There will be about 40 students and 5 adults. It is very important that the carrier is reliable, as the safety of the children is a priority. We would also like the bus to be comfortable, with seat belts, air conditioning, and, if possible, toilet. Our budget is limited, but we understand that you have to pay for reliability.