It's an awesome idea but I can't help but think one someone says bus full of people and making them surrender their weapons I instantly think of that video of the fight club, fight to the death for food and medical supplies.
I would suggest maybe a quicker vehicle if you wanted to run an ambulance (motorbike, jeep, very least an ATV even though they have a tendency to flip.
Just my two cents and more than willing to help out if needed.
Feel free to add me on steam, while not a full member does not mean I'm not up for playing a few games with or against you guys.
Steam - ColdCamV